This is the generic class for devices, per se, of general application which are used for closing or opening electrical circuits and the combination of these devices with their operating means. In the combined devices there must be something more than the mere inclusion of a circuit maker or breaker broadly.
Combinations of circuit makers and breakers with electrical plugs, sockets, or other connectors are in this class.
This class includes devices known as "controllers", "circuit-closers", "switches", "circuit-breakers", "interrupters", "distributers", "thermal-cut-offs", "fuses", and "electrical thermostats".
Electrical systems or circuits are excluded from this class. These systems or circuits are classified in the various electrical or art classes, depending on the particular form of electrical system or of the apparatus controlled.

LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
A circuit maker or breaker of this class (200) can be distinguished from an electrical connector of Class 439, Electrical Connectors, in that a circuit maker or breaker comprises an assemblage of parts including both a movable contact and its mating contact wherein there is a positive (permanent) physical connection between the contacts such that a contact is restricted to move with respect to a mating contact along a prescribed path each time the circuit maker or breaker operates, whereas an electrical connector is physically separated from the distinct, mating connector each time the circuit is broken.
The combination of an electrical circuit maker or breaker with an electrical connector will be found in this class (200). For example, an electrical connector with a distinct switch actuated by a mating connector is included in this class (200), especially in subclasses 61.58+. An electrical connector that includes integrally therewith a "switching" component actuated by coupling engagement with a mating connector is to be found in Class 439. Search especially Class 439, subclass 188 for an electrical connector having circuit interrupting provision effected by mating.
An electrical connector, per se, may include movable contacts and be in the class of electrical connectors. For example, Search Class 439, subclasses 43+ for an electrical connector with a selectable circuit wherein no details of the circuit structure is set forth; subclasses 152+ for an electrical connector detachable from a mating connector by snap or quick-break action; subclasses 259+ for a connector with a contact moved laterally into engagement with a mating contact
in a "zero insertion force device"; subclasses 296+ for an electrical connector with coupling movement-actuating means or retaining means in addition to the contact, especially subclasses 310+ for a retaining means with distinct movement-actuating means to move a coupling part axially; and subclasses 374+ for an electrical connector with guiding means for mating of a coupling part.
This class (200) has not been screened to verify placement according to this line.
Search should be made in the art or special application classes for circuit-controllers of such special type as to be peculiarly adapted for those arts-- e.g., telegraph keys in Class 178, Telegraphy, telephone-switches in Class 379, Telephonic Communications.

REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:
75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures, for patents claiming a metal composition, e.g., an alloy or a composition having a continuous phase of free metal made by consolidating metal particles.
148, Metal Treatment, subclasses 400+ for elemental metal or alloys which (a) are the product of a Class 148 process (e.g., heat treated, age hardened), (b) are claimed in terms of specific magnetic properties or as having particular internal structure which affects the magnetic properties, (c) are amorphous, (d) possess the property of shape memory, (e) are the product of a significant Class 164, Metal Founding, step (e.g., chill cast, directionally solidified, etc.), (f) are the product of the dispersion of particulate matter in molten metal which particulate retains its identity in the final product (e.g., dispersion strengthened, etc.).
178, Telegraphy, see Lines With Other Classes and Within This Class, above.
234, Selective Cutting (e.g., Punching), appropriate subclasses, and particularly subclasses 59+ for a pattern-controlled selective cutting machine wherein the pattern sensor may involve electrical circuit-controllers.
252, Compositions, subclasses 500+ for electrically conductive compositions and devices defined solely in terms of the composition of which they are composed. Included are contacts and switches defined solely in terms of their composition or stock.
313, Electric Lamp and Discharge Devices, appropriate subclasses. Class 313 is the generic class for space discharge devices. See subclasses 146+ of Class 313 for
discharge devices which are provided with a movable electrode. Some discharge devices are closely analogous in structure to some types of circuit makers and breakers. See Lines With Other Classes and Within This Class in Class 313 for the distinction between a space discharge device and a circuit maker and breaker.
314, Electric Lamp and Discharge Devices: Consumable Electrodes, appropriate subclasses for electric space discharge devices designed to pass an electric current (e.g., arc, spark, etc.) between two electrodes spaced apart in a vacuum or a gas or vapor atmosphere (including atmospheric air). See Class 314 where the discharge device is provided with an electrode which is consumed during the operation and has means to feed the electrodes together to compensate for the consumption of the electrode.
333, Wave Transmission Lines and Networks, subclasses 101+ for plural channel systems including branched circuits with switching, subclass 13 for resonator type breakdown discharge system, e.g., T-R or R-T systems, and subclass 262 for long line elements and components which may perform a switching or blocking function, e.g., long line short circuiting switches and long line shorting plugs.
334, Tuners, subclasses 47+ for tuners which are varied or adjusted by a switching operation which usually involves a make and break type switch.
343, Communications: Radio Wave Antennas, subclass 768 for slot type antennas with periodic control of the slot or coupling; subclass 777 for plural wave guide type antennas with control of the individual antenna; subclass 876 for antennas with switching between the antennas and lines; and subclass 904 for antennas which may be combined with a switch.
361, Electricity: Electrical Systems and Devices, subclasses 600+ for arrangements of circuit closures on a mounting or in a housing. See also, subclass 115 for specific circuit breaker structure in protection of safety of a system or device.
379, Telephonic Communications, see Lines With Other Classes and Within This Class, above.
420, Alloys or Metallic Compositions, for alloys containing metal or metallic compositions which contain a continuous phase of metal.
427, Coating Processes, subclasses 58+ for coating processes, per se, wherein an electrical product is produced.
428, Stock Material or Miscellaneous Articles, appropriate subclasses, especially subclasses 379+ for coated electrical conductors which may include contacts and
switches, but which are merely coated bases recited solely as a substrate with a particular coating therein; see also subclasses 411.1+ for a composite web or sheet which is characterized solely by the compositions of the layers.
439, Electrical Connectors, see Lines With Other Classes and Within This Class, above.

This subclass is indented under the class definition. Devices in which a plurality of contacts are arranged to control two or more circuits.
(1) Note. This group includes motor and resistance controllers, per se, the combination of these with electro-magnetic control, and operators peculiar to this type of circuit control.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.01 for devices for the periodic control of a plurality of circuits.
subclasses 33+ for combinations with retarding means.
subclasses 51+ especially subclasses 51.03-51.06 for multiple circuit control switches actuated by or claimed in combination with a plug, socket, or other connector coupling device.

This subclass is indented under subclass 1. Devices for connecting a loop or shunt circuit into a main circuit without at any time completely interrupting the circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 51+ especially subclass 51.1 for such devices actuated by or claimed in combination with a plug, socket, or
other connector coupling device.

This subclass is indented under subclass 1. Devices include combinations with thermal current cut outs or fuses. These devices are generally used for starting alternating-current motors.

SEE OR SEARCH CLASS:
337, Electricity: Electrothermally or Thermally Actuated Switches, for thermal-current cut outs, per se.

This subclass is indented under subclass 1. Devices in which a contactor moving in a circular path is combined with one moving in a straight line.

This subclass is indented under subclass 1. Devices comprising a plurality of switches each being separately operated and usually provided with interlocking means to permit their operation only in a definite order.

SEE OR SEARCH THIS CLASS, SUBCLASS:
9 for multiple contact or pivoted contact of plural switch devices.
13 for dial-type plural switch devices.
18 for plural switch devices with operating means.
50.01 for retarded interlocking switches.

SEE OR SEARCH CLASS:
341, Coded Data Generation or Conversion, subclasses 22+ for a keyboard controlled code transmitter.

This subclass is indented under subclass 1. Devices in which the contactors are mounted so as to move in a circular path.

SEE OR SEARCH THIS CLASS, SUBCLASS:
4 for combined pivoted and reciprocating contact switches.
37 for retarded multiple contact rotary switches.

This subclass is indented under subclass 6. Devices comprising two or more of the following different types of pivoted contact controllers.

This subclass is indented under subclass 6. Devices in which the contact-pressure between the fixed and movable contacts is exerted in a line radial to the arc of movement of the pivoted contact.
(1) Note. This type comprises largely the devices known as "drum-controllers".

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for radial contact pressure pivoted switch combined with other type.
17 for radial contact pressure switches with operating means.

This subclass is indented under subclass 8. Devices in which two or more controllers have movement relative to one another.

This subclass is indented under subclass 8. Devices in which special means are provided for extinguishing or preventing the formation of arcs upon separation of the contacts.

SEE OR SEARCH CLASS:
218, High-Voltage Switches With Arc Preventing or Extinguishing Devices, subclasses 1+ for arc preventing or extinguishing devices

This subclass is indented under subclass 6. Devices comprising two or more contacts arranged in the arc of a circle, the contact-surface being in a plane and having a pivoted cooperating sliding contact moving in a plane parallel to that of the contact-surfaces.

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for dial-type switch combined with other type.
17 for dial type switch with operating means.

This subclass is indented under subclass 11. Devices in which the movable contact is biased toward a certain position, usually the off position, and is adapted to be held in some other position and released by means of an electromagnet.

SEE OR SEARCH CLASS:
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclasses 2+ for electromagnetically actuated circuit controllers generally.

This subclass is indented under subclass 12. Devices in which there are two or more controllers which have movement
relative to one another.

This subclass is indented under subclass 11. Devices comprising two or more dial-type controllers which have movement relative to one another.

This subclass is indented under subclass 6. Devices comprising conducting blades adapted to make contact by being projected between conducting leaves.

SEE OR SEARCH THIS CLASS, SUBCLASS:
3 for pivoted contact knife blade switch combined with thermal current.
7 for pivoted contact knife blade switch combined with other type of pivoted contact switch.
subclasses 554+ for single-contact switches of the knife-blade type.

This subclass is indented under subclass 1. Devices in which the movable contact operates in a straight line.

SEE OR SEARCH THIS CLASS, SUBCLASS:
4 for combined reciprocating contact and pivoted contact switch.

This subclass is indented under subclass 1. Means peculiarly adapted for the operation of multiple-circuit controllers.
(1) Note. Search should be extended to appropriate subclasses in this group of multiple-circuit control.

SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, for operators of general application; and subclass 565 for controller checks.

This subclass is indented under subclass 17. Devices for operating two or more controllers which have movement relative to one another.

SEE OR SEARCH THIS CLASS, SUBCLASS:
9 for radial pivoted contact pressure plural switches.
13 for dial-type plural switch, electromagnetic release.
14 for dial-type plural switch.

PERIODIC:
This subclass is indented under the class definition. Devices in which the circuit is made and broken intermittently or at constantly recurring intervals.
(1) Note. There is usually a constantly driven member which operates a contact or plurality of contacts to intermittently make and break the contact.
(2) Note. This group includes devices known as "interrupters", "distributors", and "flashers".

Combined:
This subclass is indented under subclass 19.01. Devices comprising a plurality of circuit-controllers, one at least of which is of the intermittent type.

Rotary and cam:
This subclass is indented under subclass 19.02. Subject matter in which a rotating intermittent contact is combined with a cam-operated contact.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.07 for rotary multiple contact.
19.13 for cam-operated multiple contact.
19.18 for periodic rotary contact.

Timer:
This subclass is indented under subclass 19.03. Subject matter including a special clock mechanism used to perform switching operations at predetermined time intervals.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.08 for rotary multiple-contact timer.
19.29 for cam-operated periodic contact timer.
19.31 for periodic contact breaker assembly timer.

Adjustable:
This subclass is indented under subclass 19.03. Subject matter in which means are provided for changing the relative positions of the fixed and movable contacts to vary the time of contact.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.11 for adjustable rotary multiple contact.
19.19 for periodic adjustable rotary contact.
19.21 for adjustable cam-operated contact.

Multiple contacts:
This subclass is indented under subclass 19.01. Subject matter in which a plurality of moveable contacts are arranged for engagement with a plurality of fixed contacts.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 1+ for multiple-circuit control generally.

Rotary:
This subclass is indented under subclass 19.06. Subject matter in which a rotating contact cooperates with a plurality of contacts.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for periodic rotary and cam-operated contact.
19.18 for periodic rotary contact.
subclasses 36+ for retarded clock train, plural-contact rotary switch.

Timer:
This subclass is indented under subclass 19.07. Subject matter wherein the rotary contact is used in a special clock mechanism to perform switching operations at predetermined time intervals.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.04 for rotary and cam contact timer.
19.29 for cam-operated periodic contact timer.
19.31 for periodic contact breaker assembly timer.

Commutator:
This subclass is indented under subclass 19.07. Subject matter wherein the rotary contact is used in a direct current generator to reverse the direction of an electric current and maintain a current flowing in one direction.

Distributor:
This subclass is indented under subclass 19.07. Subject matter wherein the rotary contact is used in a device in a multicylinder engine for distributing the ignition voltage to the spark plugs in a definite sequence.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.14 for automotive distributor.
19.24 for cam-operated distributor plate.

Adjustable:
This subclass is indented under subclass 19.07. Subject matter in which the relative positions of the fixed and movable contacts may be changed to vary the time of contact.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.05 for adjustable rotary and cam-operated contact.
19.19 for adjustable rotary-operated contact.
19.21 for adjustable cam-operated contact.

Radial contact pressure:
This subclass is indented under subclass 19.07. Subject matter in which the contact pressure between the fixed and movable contacts is exerted in a line radial to the arc of movement of the pivoted contact.

Cam operated:
This subclass is indented under subclass 19.06. Subject matter in which the movable contacts are operated by a rotating cam or cams.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for periodic rotary and cam-operated contact.
19.2 for periodic cam-operated contact.

For automotive:
This subclass is indented under subclass 19.13. Subject matter in which the switches are used in automobiles.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.1 for rotary multiple-contact distributor.
19.24 for periodic cam-operated distributor plate, per se.

Programming timer:
This subclass is indented under subclass 19.13. Subject matter including an electromechanical timer which repeats a preset program continuously.

For sign display:
This subclass is indented under subclass 19.15. Subject matter in which the switches are used for general advertising and display.

Traffic control signs:
This subclass is indented under subclass 19.16. Subject matter whose use as the display sign is directly associated with a traffic control for automobiles, airplanes, elevators, etc.

Rotary:
This subclass is indented under subclass 19.01. Subject matter in which a rotating contact cooperates with a fixed contact.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for periodic rotary and cam-operated contact.
19.07 for rotary multiple contact.
19.13 for cam-operated multiple contact.
subclasses 36+ for retarded clock train rotary switch.

Adjustable:
This subclass is indented under subclass 19.18. Subject matter in which the relative positions of the fixed and movable contacts may be changed to vary the time of contact.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.05 for adjustable rotary and cam-operated contact.
19.11 for adjustable rotary multiple contact.
19.21 for adjustable cam-operated contact.

Cam operated:
This subclass is indented under subclass 19.01. Subject matter in which the movable contact is actuated by a cam.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for periodic rotary and cam-operated contact.
19.13 for periodic cam-operated multiple contact.
subclasses 38+ for retarded clock train, cam-operated
switch.

Adjustable:
This subclass is indented under subclass 19.2. Subject matter wherein means are provided for changing the relative positions of the cam and cooperating contact.
(1) Note. The adjustment may be manual or automatic.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.05 for adjustable rotary and cam-operated contact.
19.11 for adjustable rotary multiple contact.
19.19 for periodic adjustable rotary contact.

SEE OR SEARCH CLASS:
464, Rotary Shafts, Gudgeons, Housings, and Flexible Couplings for Rotary Shafts, subclasses 1+ for a speed responsive device for adjusting the relative rotational position of coupled members.

Contact breaker assemblies:
This subclass is indented under subclass 19.21. Subject matter including complete adjustable operating units so that the adjustment of the breaker contact points is made during actuation of the cam.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.26 for automotive distributor contact assembly.
19.3 for periodic contact breaker assembly.

Centrifugal advance mechanism:
This subclass is indented under subclass 19.21. Subject matter including a mechanism directed outward away from a center that is used for automatically advancing the time of the spark in response to a predetermined increase in engine speed.
(1) Note. The centrifugal advance mechanism may be used singly or in combination with a vacuum or suction controlled advance mechanism.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.25 for vacuum or suction controlled advance mechanism.

Distributor plate:
This subclass is indented under subclass 19.21. Subject matter including a broad, thin sheet of metal to which the contact breaker structure may be mounted.
(1) Note. The mounting of the plate assembly may be adjacent to the shaft and also to the housing. The mounting structure prevents undue vibration of the contact breaker assembly.
(2) Note. The distributor plate assembly may also be referred to as "cam plate" or "interrupter plate".

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.01 for periodic breakers of general utility.

Vacuum or suction controlled advance mechanism:
This subclass is indented under subclass 19.21. Subject matter wherein the process or condition of sucking controls advance mechanism, directly responsive to changes in engine temperature, automatically adjusts the time of the spark.

Automotive distributor contact breaker assembly:
This subclass is indented under subclass 19.2. Subject matter wherein the cam-operated contact breaker assembly is used in automotive distributors.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.22 for adjustable contact breaker assembly.
19.3 for general contact breaker assemblies of periodic
switches.

Contact breaker lever detail:
This subclass is indented under subclass 19.26. Subject matter comprising details of a rigid bar turning upon an axis and its associated support members and contacts.
(1) Note. The support member includes pivot post and cam follower.

Ignition point detail:
This subclass is indented under subclass 19.26. Subject matter comprising details of a set of ignition points.

Timer:
This subclass is indented under subclass 19.26. Subject matter including a special clock mechanism used to perform switching operations at predetermined time interval.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.04 for rotary and cam contact timer.
19.08 for rotary multiple-contact timer.
19.31 for periodic contact breaker assembly timer.

Contact breaker detail:
This subclass is indented under subclass 19.01. Subject matter comprising details of a contact breaker.
(1) Note. The contact breaker assembly may be either (a) a distributor cap-rotor combination or (b) cam operated.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.22 for adjustable contact breaker assembly.
19.26 for automotive distributor contact assembly.

Timer:
This subclass is indented under subclass 19.3. Subject matter including a special clock mechanism used to perform switching operations at predetermined time intervals.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.04 for rotary and cam-contact timer.
19.08 for rotary multiple-contact timer.
19.29 for cam-operated periodic contact timer.

Distributor cap detail:
This subclass is indented under subclass 19.01. Subject matter comprising details of a distributor cap which may include fixed contact arrangements, adjustability of cap to housing, electrical connection of wires to the cap, ventilation means, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.38 for protective cover means disposed on the distributor or wires for multipurpose shielding functions.

Distributor rotor detail:
This subclass is indented under subclass 19.01. Subject matter comprising details of a distributor rotor-contact arrangement.

Elevated:
This subclass is indented under subclass 19.01. Subject matter in which the circuit breaker is lifted up for easy access.

Locks:
This subclass is indented under subclass 19.01. Subject matter including a mechanism for preventing operation of the distributor contact assembly or removal of the distributor cap.

Magnet:
This subclass is indented under subclass 19.01. Subject matter which contains a plurality of switches operated periodically by a fixed or rotatable permanent magnet assembly.

SEE OR SEARCH CLASS:
123, Internal-Combustion Engines, subclass 154 for electromagnetically actuated switches.
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclasses 205+ for permanent magnet actuated nonperiodic switches.

Traffic signal:
This subclass is indented under subclass 19.01. Subject matter wherein the circuit breaker produces a set of signals operating the movement of vehicles, ships, or persons in an area.

Wire guard:
This subclass is indented under subclass 19.01. Subject matter in which a protective cover means (e.g., rubber, metal, wood, etc.) encapsulates the distributor housing or cap and wires.
(1) Note. The protective cover means shields the internal distributor from moisture, etc. and also may serve as radio interference shielding means.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.32 for distributor cap.

Distributor:
This subclass is indented under subclass 19.01. Subject matter in which a rotary contact is used in a device in a multicylinder engine for distributing the ignition voltage to the spark plugs in a definite sequence.

With noise preventing means:
This subclass is indented under subclass 19.39. Subject matter including means to suppress noise which radiates from the ignition distributor.

This subclass is indented under the class definition. Devices including means for timing or delaying the operation of the contacts.
(1) Note. These devices include the so-called "time-switches".

SEE OR SEARCH CLASS:
178, Telegraphy, subclass 76 for retarded circuit closers peculiar to telegraph systems.
307, Electrical Transmission or Interconnection Systems, subclasses 141+ for a switching system including a time delay or retardation means controlling a switch actuation.
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclasses 59+ for electromagnetically operated retarded circuit-makers.
337, Electricity: Electrothermally or Thermally Actuated Switches, appropriate subclasses for electrothermally and thermally actuated switches with retarded action.

This subclass is indented under subclass 33. Devices in which the retarding means is a dashpot.

SEE OR SEARCH CLASS:
188, Brakes, subclasses 297+ for a dashpot, per se.

This subclass is indented under subclass 33. Devices in which clocks, clock-trains, or similar gearing are used as a retarding means.

This subclass is indented under subclass 35. Devices in which the movable contact has a rotary motion.

This subclass is indented under subclass 36. Devices in which the movable contact cooperates with a plurality of fixed contacts.

This subclass is indented under subclass 35. Devices in which the contacts are operated by means of a rotating cam.

This subclass is indented under subclass 35. Devices in which
the switch contact is held from movement by means of a latch which is released by a clock mechanism.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 405+ for oscillating contact double snap switch.
subclasses 427+ for reciprocating contact latch switch.
subclasses 468+ for oscillating contact single snap of switch.

SEE OR SEARCH CLASS:
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclasses 39+ for electromagnetically actuated retarded trips in automatic circuit interrupters, and subclasses 174+ for electromagnetically actuated latch trips.

This subclass is indented under subclass 39. Devices in which the tripping of the latch releases a motor, usually a spring-motor, which operates the contact.

This subclass is indented under subclass 39. Devices in which the tripping of the latch releases a weight, which in falling operates the contact.

PLURAL SWITCHES CONTROL SINGLE CIRCUIT:
This subclass is indented under the class definition. Devices wherein a single circuit is closed or opened by placing a plurality of circuit controlling switches in a specified relationship to complete or open the circuit.
(1) Note. These devices are commonly known as permutation switches.
(2) Note. The switches are normally in series when the desired state is circuit completion and the switches are normally parallel when the desired state is an open circuit.

Coded removable actuator:
This subclass is indented under subclass 42.01. Devices including a separate and distinct actuator for opening or closing the switches in a predetermined pattern, which actuator can be withdrawn from the switch (e.g., key).

SEE OR SEARCH THIS CLASS, SUBCLASS:
43.06 for devices of the type where each individual switch controls a circuit.

SWITCH ACTIVATION INHIBITOR (e.g., UNAUTHORIZED INADVERTENT USE PREVENTION):
This subclass is indented under the class definition. Devices having structure to prohibit or restrain the operation of a switch actuator including for example coded elements (e.g., combination codes), locks or other circuit completing means.
(1) Note. The term "switch" is a device for making or breaking an electrical circuit and it normally activated by an "actuator". The actuator may take many forms such as button, handles, keys or some other type of element. A "coded element" may be in the form of a special tool, key, combinations such as permutation codes or combination locks.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 5+ and 50.01+, for interlock switches which have the actuator blocked depending upon the condition of the plug, the switch housing or another switch.
304 and 333, for switch shields which limit access to the actuator but which do not block the actuator or prevent access to the actuator.

SEE OR SEARCH CLASS:
380, Cryptography, particularly subclasses 26+ for mechanical control of signal encryption.

Combined which connector coupling:
This subclass is indented under subclass 43.01. Devices wherein a lock-type switch is associated with an electrical connector for opening and closing an electrical circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 51+ for connector couplers which do not include restraining or inhibiting means and see the definitions of 51+ for placement of combined switches and electrical connectors classifiable in this subclass and subclasses 51+.

Engine starter protector:
This subclass is indented under subclass 43.01. Devices having structure which prevents an actuator for an ignition switch from being returned to start position after being activated without first being moved to "off", standby or some other nonactivated position.

Removable actuator:
This subclass is indented under subclass 43.01. Devices wherein the actuator is designed to be readily removable.
(1) Note. The actuator is in many instances termed a key.

Actuator is circuit completing element:
This subclass is indented under subclass 43.04. Devices wherein the switch is activated by introducing a coded actuator which becomes part of the circuit-completing means.

SEE OR SEARCH CLASS:
439, Electrical Connectors, appropriate subclasses for contact plugs in general.

Plural switches actuated by a single coded element:
This subclass is indented under subclass 43.04. Devices comprising multiple switch contacts to activate multiple circuits where all circuits are selectively actuated by introducing a single coded element.

SEE OR SEARCH THIS CLASS, SUBCLASS:
42.02 for devices of the type where a single circuit is controlled by the switches.

Reciprocating actuator activates switch:
This subclass is indented under subclass 43.04. Devices wherein the switch device includes structure which is mechanically moved to an activated condition by inserting a coded element, and to a nonactivated condition by removal of the coded element.
(1) Note. The activated condition may be either opened or closed.

By rotation of actuator:
This subclass is indented under subclass 43.04. Devices wherein the actuator is a coded element normally referred to as a key which key activates a switch device typically including structure such as lock cylinders and plungers.
(1) Note. The devices provided for in this subclass require a key which will only operate a switch having a matching plunger configuration.

Combination automatically actuates switch:
This subclass is indented under subclass 43.01. Devices wherein contacts are spontaneously activated by means of a
series of combination moves of a combination lock.
(1) Note. The combination locks provided for in this subclass are generally disclosed as tumbler type, where a series of correct rotations of the operating mechanism releases a part of the lock to automatically activate the switch contacts.

SEE OR SEARCH THIS CLASS, SUBCLASS:
43.12 for combination lock which control a separate locked actuator and the actuator must first be unlocked before it can be manipulated.

Actuator locking device:
This subclass is indented under subclass 43.01. Devices including means that prevent unauthorized movement of the actuator or the contacts, or prohibits access to the actuator, until the lock is opened.

Combination lock control actuator:
This subclass is indented under subclass 43.11. Devices wherein a combination type lock prevents manipulation of a separate and distinct switch actuator.

Reciprocating actuator (e.g., push button):
This subclass is indented under subclass 43.11. Devices wherein the actuator is a button or knob that when pushed operates to open or close an electric circuit, and including a lock which prevents operations of the button or knob.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 159+ and 340+, for various types of push button actuators including push-push and push-pull.

Circuit breaker handle type (i.e., padlock):
This subclass is indented under subclass 43.11. Devices wherein the actuator comprises a handle type assembly which is prevented from any movement by means of a removable lock.
(1) Note. The padlock device must be removable for proper classification in this subclass.

Including attachments to lock handle:
This subclass is indented under subclass 43.14. Devices wherein the actuator is prevented from movement by means attached to the handle assembly in addition to the lock.

Actuator blocking device (e.g., latch):
This subclass is indented under subclass 43.01. Devices including structure which prevents the inadvertent movement of the actuator, and which must be moved or removed in order to move the actuator.

Hand grip type (e.g., power tool):
This subclass is indented under subclass 43.16. Devices wherein the actuator preventing means is structurally attached to the handle portion of a hand held appliance.

Push button type:
This subclass is indented under subclass 43.16. Devices wherein the blocking device prevents the urging or depression of a button or knob.

SEE OR SEARCH THIS CLASS, SUBCLASS:
43.13 for push button type actuators that are locked and must be unlocked before the button can be depressed.

Removable blocking element:
This subclass is indented under subclass 43.16. Devices wherein the means that block the movement of the actuator must be completely removed from the switch assembly before the actuator can be moved.

Mounted on actuator:
This subclass is indented under subclass 43.19. Devices wherein the blocking element is mounted on the actuator handle, lever, plunger or other type actuator and the blocking element must be removed to enable movement of the actuator.

Locked cover prevents access to actuator:
This subclass is indented under subclass 43.01. Devices including means to enclose and lock the switch assembly.

SEE OR SEARCH THIS CLASS, SUBCLASS:
333 for actuator covers which are not of the unauthorized prevention type.

SEE OR SEARCH CLASS:
220, Receptacles, subclass 242 for closures for face plate type openings.

This subclass is indented under the class definition. Devices in which the contact is controlled by means of a perforated or embossed sheet, card, or strip.
(1) Note. This subclass is limited to such devices, per se.

SEE OR SEARCH CLASS:
84, Music, in most subclasses of "Automatic" that have the word "electric" in the titles, for combinations of
pattern-sheet-controlled circuit closers in a system.
178, Telegraphy, subclass 3 for pattern-operated automatic telegraph systems, and subclass 17 for pattern-operated telegraph transmitters or recorders.
234, Selective Cutting (e.g., Punching), subclasses 59+ for a pattern controlled selective cutting machine which may involve electrical circuit controllers.
235, Registers, subclass 56 for voting machines using sheet controlled switches, and subclasses 441+, 444+ and 452 for record-sensing devices wherein switches may be opened or closed or circuits made in accordance with areas on the record that contain coded indicia, the area where said indicia is sensed conveying particular information.
341, Coded Data Generation or Conversion, subclasses 20+ and 173+ for a pulse code transmitter of general utility.
345, Computer Graphics Processing, Operator Interface Processing, and Selective Visual Display Systems, subclasses 108+ for visual display systems including plural mechanically movable display elements with selective electrical control.

This subclass is indented under the class definition. Devices include circuit-controllers adapted to limit the travel of electrically-driven devices. They are generally used in hoisting devices to break the circuit at the desired limits of travel.

This subclass is indented under the class definition. Devices especially adapted for breaking high-voltage circuits.
(1) Notes. These breakers are generally used out of doors and contacts separate in the air. They are usually provided with horn arc-dissipating means.

SEE OR SEARCH THIS CLASS, SUBCLASS:
49 for high potential type switches adapted for use as pole switches.

SEE OR SEARCH CLASS:
313, Electric Lamp and Discharge Devices, appropriate subclasses for electric space discharge devices, including arc and spark discharge devices.

This subclass is indented under the class definition. Devices adapted to be mounted on a telephone-pole to disconnect the transmission-line. They are usually adapted to be operated from indoors and isolate the telephone during a storm.

SEE OR SEARCH THIS CLASS, SUBCLASS:
48 for high potential type switches.
subclasses 538+ for mechanical pull type switches.

Interlocking:
This subclass is indented under the class definition. Devices in which means are provided for insuring a predetermined sequence of operation of a plurality of switches or of a switch and an associated element, as the switch-casing cover or an auxiliary plug.

SEE OR SEARCH THIS CLASS, SUBCLASS:
5 for multiple switch for multiple circuit control, having interlocking means.

SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclass 483 for interlocking devices generally.
246, Railway Switches and Signals, subclasses 131+ for railway signaling systems involving interlocking switch arrangements.
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclass 120 and 60 for an interlock associated with electrical power distribution systems and devices.
337, Electricity: Electrothermally or Thermally Actuated Switches, subclass 43, 201 and 339 for an interlock
associated with electrothemally or thermally actuated switches, and subclasses 284+ for a plurality of fusible switches selectively or sequentially inserted in the same circuit.
361, Electricity: Electrical Systems and Devices, subclasses 601+ for an interlock associated with electrical power distribution system and devices.

Between switches and housing:
This subclass is indented under subclass 50.01. Subject matter wherein the interlocking means associated between the switch and a casing, a box, or a container having a cover or a door to facilitate engagement and disengagement of switch operating mechanism.

Handle latches cover:
This subclass is indented under subclass 50.02. Subject matter wherein the element includes means attached to the housing to be gripped by the hand to latch the cover or the door when the switch is closed.

Simultaneous operation:
This subclass is indented under subclass 50.03. Subject matter including means to actuate the cover or the door and the switch to be opened or closed at the same time.

Handle disconnected from actuator:
This subclass is indented under subclass 50.03. Subject matter including means attached to the cover of the switch box so that the cover may be opened and closed and automatically disengages and engages the handle from an interior switch actuator.

SEE OR SEARCH THIS CLASS, SUBCLASS:
50.06 for engaging and disengaging handle from an interior
switch actuator.

Handle disconnected from actuator:
This subclass is indented under subclass 50.02. Subject matter wherein the element includes means to be gripped by the hand so that automatically disengages and engages the handle from an interior switch actuator.

SEE OR SEARCH THIS CLASS, SUBCLASS:
50.05 for handle latching cover.

Fuse blocks:
This subclass is indented under subclass 50.02. Subject matter wherein an insulating base or slab houses a protective device, usually a short piece of wire but sometimes a chemical compound which melts and breaks a circuit when a current exceeds a rated value.

Contacts shielding member:
This subclass is indented under subclass 50.02. Subject matter including a barrier member for protecting or screening terminal contacts of the switch from electric or magnetic fields generated within the device.

With key-controlled:
This subclass is indented under subclass 50.02. Subject matter including a metal instrument inserted into the interlocking means to move its bolt to operate the device.

Lid-controlled:
This subclass is indented under subclass 50.02. Subject
matter wherein the interlocking means is controlled by a movable piece, separate or hinged, for closing the opening of the housing.

Switch handle locking means:
This subclass is indented under subclass 50.02. Subject matter including a mechanical means for fastening or securing a switch handle in a position.

Dual interlocked between door and switch:
This subclass is indented under subclass 50.02. Subject matter wherein the interlocking means is operatively connected between the switch mechanism and the door so that the opening of the switch is prerequisite to the opening of the door, and the closing of the door is prerequisite to the closing of the switch.

Door independently opened:
This subclass is indented under subclass 50.12. Subject matter including means to open or close the door when the switch is opened.

Lid carrying switch elements (e.g., contacts, terminals, or movable switch member):
This subclass is indented under subclass 50.12. Subject matter wherein the housing cover carries the switching elements such as contacts, terminals, or a moving switch member.

Defeater interlock:
This subclass is indented under subclass 50.12. Subject matter including means to deactivate the interlocking means
so that the door can be open while the switch is closed.

Independently locked switch:
This subclass is indented under subclass 50.12. Subject matter including a second locking mechanism, independent of the interlocking means, to lock the switch in its closed or open positions.

Drawout-type switchgear:
This subclass is indented under subclass 50.12. Subject matter comprising an aggregate of switching facilities having components on a sliding box or receptacle that is opened by pulling out and closed by pushing in, combined with an enclosure for a power station or transforming station.

SEE OR SEARCH THIS CLASS, SUBCLASS:
50.21 for interlocking means, per se.

Switch latches cover:
This subclass is indented under subclass 50.02. Subject matter including means automatically locks a lid of the switch housing in a closed position when the switch is electrically closed.

Predetermined handle position locks or unlocks switch:
This subclass is indented under subclass 50.02. Subject matter including means attached to the housing to be gripped by the hand for selectively locking or unlocking a cover of the switch housing closed in one or more predetermined positions of such handle corresponding to the opened and closed condition of the switch.

For bus-duct type:
This subclass is indented under subclass 50.02. Subject matter wherein the interlocking means is used for a duct run containing bus bars and a connector box having retractable contacts and an interlock cover to prevent the opening of the box when the contacts are in the engaged position.

Drawout-type switchgear:
This subclass is indented under subclass 50.01. Subject matter comprising an aggregate of switching facilities having components on a sliding box or receptacle that is opened by pulling out and closed by pushing in, combined with an enclosure for a power station or transforming station.

SEE OR SEARCH THIS CLASS, SUBCLASS:
50.17 for dual interlocked between door and switch.

Shutter over contacts:
This subclass is indented under subclass 50.21. Subject matter wherein the interlock means is in the form of a sliding guard or shutter which physically closes off connecting apertures to the switch gear contacts.

Truck type:
This subclass is indented under subclass 50.21. subject matter wherein the drawout-type switch gear is carried by a carriage with wheels.

With racking mechanism:
This subclass is indented under subclass 50.21. Subject matter including a force amplifying or levering mechanism for locking the breaker in each of its plurality of positions automatically without need for guesswork by the operator as to how far the circuit breaker must be moved to place it in the desired position.

Racking screw:
This subclass is indented under subclass 50.24. Subject matter wherein the racking mechanism is a forming a continuous helical rib, or thread, with the cylindrical shank, or spindle, from which it projects.

With position indicating means (i.e., connect, disconnect, or test):
This subclass is indented under subclass 50.21. Subject matter including means providing a visual indication of the connect, disconnect, or test positions of the circuit interrupter unit in the draw-out type switchgear.

Contact or contact mounting structure:
This subclass is indented under subclass 50.21. Subject matter comprising structural details of support to hold electrode, or electrode which engages or disengages to open or close the circuit within the circuit interrupter,

Between switch and connector assembly:
This subclass is indented under subclass 50.01. Subject matter wherein the locking means is associated with the switch and a connector assembly comprising a plug and an outlet to facilitate engagement and disengagement of switch operating mechanism.

Switch locks plug:
This subclass is indented under subclass 50.28. Subject matter wherein the locking means prevents the withdrawal of the plug except when the switch is in the off position.

Dual interlock:
This subclass is indented under subclass 50.28. Subject matter wherein the interlocking means is operatively connected between the switch mechanism and the connector assembly so that the opening of the switch is prerequisite to the opening the plug from the receptacle, and the locking the plug on the receptacle is prerequisite to the closing the switch.

Plug controls switch:
This subclass is indented under subclass 50.28. Subject matter including means which prevents withdrawal of the plug from the receptacle when the switch is in the on position, and to prevent movement of the switch into the on position in the absence of a plug positioned in the receptacle.

Between plural switches:
This subclass is indented under subclass 50.01. Subject matter including two or more switches with the interlocking mechanism connecting the switches such that the operation of one or more of those switches affects the operation of the others of the switches.

Alternately operated:
This subclass is indented under subclass 50.32. Subject matter including means to control the operation of the electrical switch, to maintain one electrical switch in an inoperative condition during the time that another electrical switch is energized.

Rotary:
This subclass is indented under subclass 50.33. Subject
matter wherein the switches which turn and variable interleaf in a circular or orbital path about a fixed axis.

Pivot:
This subclass is indented under subclass 50.33. Subject matter including a pin or shaft on the end of which the switch is rested and turned or rotated.

Push button:
This subclass is indented under subclass 50.33. Subject matter wherein the switch contacts are moved into engagement or disengagement by a push button actuator having a single surface on which pressure is exerted to engage and disengage the contacts.

Sequentially operated:
This subclass is indented under subclass 50.32. Subject matter wherein the interlocking arrangement for two or more operating mechanisms of two or more switches in series conducting relation whereby one switch must be opened before the other switch or switches can be opened.

Grounding transformer switch:
This subclass is indented under subclass 50.37. Subject matter including a transformer switch intended primarily for the purpose of providing a neutral point for grounding purposes.

Disconnect switch:
This subclass is indented under subclass 50.37. Subject matter including an electrical switch of the bypass type for removing a load from its electrical supply sources.

With handle:
This subclass is indented under subclass 50.37. Subject matter wherein the interlocking means is gripped by the hand to control the operation of the electrical switches.

This subclass is indented under the class definition. Connector coupling devices (a) combined with a switch in a unitary structure, or (b) capable of functioning as a switch; i.e., having means specially provided for holding the complementary coupling parts in mechanically coupled but open-circuit position. (For exceptions, see especially Note (4) below).
(1) Note. "Connector coupling" as used above refers to electrical connectors, other than mere binding posts, comprising a pair of complementary parts each having contact means adapted to be readily engaged or disengaged by manipulation of said parts. Such parts are commonly known as plugs, sockets, receptacles, and the like.
(2) Note. For the distinction between "connectors" and "switches", see Note (3) to the main class definition.
(3) Note. The plug, socket, et cetera, may constitute or be combined with the base of a lamp, heater, or other translating device and mere recitation by name only of the lamp, heater, or such other device does not exclude the patent from this class.
(4) Note. Combinations of connector-coupling devices with the following specified types of circuit makers and breakers are excluded from this subclass and will be found in the subclasses indicated below in Search This Class, Subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 19+ for periodic switches.
subclasses 33+ for retarded switches.
50.01 for switches and connectors.

SEE OR SEARCH CLASS:
315, Electric Lamp and Discharge Devices: Systems, subclasses 32+ for electric lamps and electric space discharge devices which have structurally combined therewith an electric switch, note especially subclasses 32, 47, 63, 64+, subclasses 72, 73, and 74+.
439, Electrical Connectors, especially subclass 188 for an electrical connector having circuit interrupting provision effected by mating or having a "dead" contact actuated after mating. See Lines With Other Classes and Within This Class in this class (200) for more details of the lines between this class and Class 439.

This subclass is indented under subclass 51. Devices the parts of which are specially shaped or arranged to resemble a candle or to permit the assembly to be inclosed in a relatively elongated tubular sheath having the appearance of a candle.

SEE OR SEARCH CLASS:
362, Illumination, subclass 190, 202 and 392+ for such devices claimed in combination with light modifying or distributing means.
439, Electrical Connectors, subclasses 123+ for electrical connectors, per se, which simulate a candle in shape.

This subclass is indented under subclass 51. Devices having a plurality of separate plug, socket, or other coupling parts for cooperation with a like number of complementary coupling parts.
(1) Note. This subclass includes, for example, (a) devices having a plug at one end and a socket at the other, sometimes known as adapters, (b) lamp sockets having one or more plug receptacles combined therewith, and (c) multiple lamp sockets, sometimes known as cluster lamp sockets.

SEE OR SEARCH CLASS:
439, Electrical Connectors, subclasses 638+ for two or more
plural contact coupling part connectors combined in one integral unit.

This subclass is indented under subclass 51.02. Devices in which single or plural switching means may be so operated as to open or close a selected part only of the total number of circuits under control of the switching means.
(1) Note. This subclass includes, for example, multiple lamp sockets having a switch which can be operated to light any desired number of lamps at will of the operator.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 1+ for switches, per se, for multiple-circuit control.
19.01 for switch devices for periodic control of a plurality of circuits.
51.05 for single coupling connector devices combined with multiple-circuit, selective switching means.

This subclass is indented under subclass 51.03. Devices in which the switching means comprises two or more independent switches, each complete in itself, and having separate operating means.
(1) Note. This subclass includes, for example, multiple lamp socket devices, each socket of which is provided with an individual switch.

This subclass is indented under subclass 51. Single coupling connector devices in which single or plural switching means may be so operated as to open or close a selected part only of the total number of circuits under control of the switching means.
(1) Note. This subclass includes, for example, lamp sockets combined with switching means for selectively controlling a remote lamp in addition to the lamp in the socket.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 1+ for switches, per se, for multiple-circuit control.
51.03 for multiple-coupling connector devices combined with selective switching means.

This subclass is indented under subclass 51.05. Devices in which the coupling member has three or more insulated contacts for cooperation with the contacts of a complementary coupling member.
(1) Note. This subclass includes, for example, multiple-filament lamp sockets having switching means for selectively lighting the filaments to effect different degrees of illumination.

SEE OR SEARCH CLASS:
315, Electric Lamp and Discharge Devices: Systems, subclasses 64+ for such devices claimed in combination with a multiple filament lamp.
439, Electrical Connectors, subclasses 626+ for a plural-contact coupling part which may have three or more contacts.

This subclass is indented under subclass 51. Devices in which the two complementary parts of a connector coupling may be moved relative to one another to open or close a circuit, without completely uncoupling the parts.
(1) Note. This subclass includes, for example, plug and socket devices wherein the circuit may be broken by turning the plug in the socket without removing the plug from the socket.
(2) Note. Where the circuit can be broken by partially uncoupling the plug from its socket, this subclass includes only those wherein special means (latch, detent, etc.) is provided for holding the parts in their partially uncoupled relation. Thus, this subclass does not take mere screw-threading coupling devices, such as screw-shell lamp sockets in which the lamp may be extinguished by partially unscrewing the same from the socket, unless special means are provided for holding the lamp in the "Off" position.

SEE OR SEARCH THIS CLASS, SUBCLASS:
51.09 for connector coupling devices wherein a switching means automatically operated by the act of separating the parts of the coupling.

This subclass is indented under subclass 51.07. Devices in which the coupling is of the "Bayonet" type; i.e., coupling of the parts is effected by engagement of a pin, stud, or other projection carried by one of the parts in a slot or groove having entrance and seat portions and formed in the other part.

This subclass is indented under subclass 51. Devices in which a switch is automatically operated upon engagement or disengagement of the complementary coupling parts.
(1) Note. This subclass includes, for example, lamp sockets wherein upon removal of the lamp therefrom, a switch automatically opens the circuit of the socket contacts, thus preventing short-circuiting of the socket contacts by tools, foreign matter, etc., or preventing shock by accidental touching of the contacts.

SEE OR SEARCH THIS CLASS, SUBCLASS:
51.07 for connector coupling devices in which a circuit is made or broken by relative motion of a coupling member with respect to a complementary coupling member without completely separating the coupled parts.

SEE OR SEARCH CLASS:
439, Electrical Connectors, subclasses 135+ and especially subclasses 137+ for connectors having movable nonuse covering
means operable upon disengagement of the coupling parts to cover or prevent access to any contact thereof; and subclasses 310+ for an electrical connector having a "dead" contact actuated after mating.

This subclass is indented under subclass 51.09. Devices in which separation of the coupling members automatically close a switch, usually to "short-circuit" the contacts of one of the coupling members.
(1) Note. This subclass includes, for example, (a) lamp sockets for series lighting systems having switching means automatically operable upon removal of the lamp to "short-circuit" the contacts of the socket thus permitting the remainder of the lamps in series therewith to remain lit, and (b) connector couplings used in train-line signaling systems in which separation of the coupling members causes the contacts of one of the coupling members to come together, thus completing a circuit for signaling or other purposes.

SEE OR SEARCH THIS CLASS, SUBCLASS:
51.11 for connector coupling devices having independent manually operated switching means for short circuiting the contacts of one of the coupling members.
118 for connector coupling devices having shunt-circuit closing means automatically operable in response to an over-load in the circuit.

SEE OR SEARCH CLASS:
439, Electrical Connectors, subclass 188 for an electrical connector having a circuit interrupting provision effected by mating or having a "dead" contact actuated after mating; and see Lines With Other Classes and Within This Class in this class (Class 200) definition. Search subclasses 507+ for a jumper to be temporarily inserted across an electrical flow path having means for matching or interengaging union with such connector to divert or shunt the flow of electricity so as to shorten the path and/or to preserve the circuit continuity.

This subclass is indented under subclass 51. Connector coupling members in which the switch contacts are in parallel
with or "bridge" the coupling contacts thus short circuiting the coupling contacts when the switch is closed.
(1) Note. This subclass includes, for example, lamp sockets for use in series lighting systems having a push-button or other switch for short circuiting the filament of the lamp.

SEE OR SEARCH THIS CLASS, SUBCLASS:
51.1 for connector coupling devices having short circuiting means automatically operable upon separation of the complementary coupling members.
118 for connector coupling devices having shunt-circuit closing means automatically operable in response to an over-load, in the circuit.

SEE OR SEARCH CLASS:
439, Electrical Connectors, subclass 188 for an electrical connector having a circuit interrupting provision effected by mating or having a "dead" contact actuated after mating; and see the line notes in Lines With Other Classes and Within This Class, in this class (Class 200) definition.

This subclass is indented under subclass 51. Connector coupling devices comprised of two separable coupling members, in which one of the switch contacts is mounted in or on one of the coupling members and a cooperating switch contact is mounted in or on the complementary coupling member, said switch contacts serving also as coupling contacts of the respective members.
(1) Note. This subclass includes, for example, lamp sockets of the screw-shell type, the center contact of which may be disengaged from the center contact of the lamp base by an actuating means without disturbing the relation between the lamp and the socket.

SEE OR SEARCH THIS CLASS, SUBCLASS:
51.07 for connector coupling devices wherein the circuit is opened or closed by relative movement between the coupled members without complete separation thereof.

This subclass is indented under subclass 51. Connector coupling devices in which the coupling is of the "Bayonet" type, i.e., coupling of the parts is effected by engagement of a pin, stud, or other projection carried by one of the parts in a slot or groove having entrance and seat portions, and formed in the other part.

SEE OR SEARCH THIS CLASS, SUBCLASS:
51.08 for bayonet-type couplings in which the circuit may be made or broken without completely uncoupling the parts.

SEE OR SEARCH CLASS:
439, Electrical Connectors, subclasses 671+ for a plural-contact coupling part having a bayonet-coupling contact, and see the search note appended thereto for another type of bayonet coupling electrical connector.

This subclass is indented under subclass 51. Devices in which one of the coupling members is screwed into the other to effect coupling thereof.

SEE OR SEARCH CLASS:
439, Electrical Connectors, subclasses 661+ for a plural-contact coupling part having a screw-thread-coupling contact, and see the search notes appended thereto for the location of other screw coupling type electrical connectors, per se.

This subclass is indented under subclass 51.14. Devices in which the switch is operated by means of a pull chain or cord.

SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 410+ for rotary contact pull snap switches.
subclasses 464+ for mechanical rotating pull switches.
519 for pull switches.

This subclass is indented under subclass 51.14. Devices in which the switch is operated by means of a pushbutton.

SEE OR SEARCH THIS CLASS, SUBCLASS:
156 for rotating pull switch.
subclasses 159+ for push button type switch.
410 for rotating contact pull snap switch.

This subclass is indented under subclass 51.14. Devices in which the switch is operated by means of a rotatable key.

This subclass is indented under the class definition. Devices in which the circuit maker or breaker is associated with various devices acting either as special operators for or modified to carry the circuit controller. The circuit controller must be an essential element of the combination. A mere conventional or incidental showing of the circuit controller is not enough.

SEE OR SEARCH CLASS:
315, Electric Lamp and Discharge Devices: Systems, subclasses 76+ for systems for supplying electric energy to lamps and/or electric space discharge devices of the gaseous ionization type, the system including an electric switch which is associated with a particular device (as a brake pedal), the switch being operated by the movement of some part of the device.
340, Communications: Electrical, subclasses 500+ for electric alarm systems which are automatically responsive to a condition, which condition may control a switch.
396, Photography, subclasses 180+ for illumination means with a camera shutter synchronizer wherein a switch is operated concurrently with the actuation of the shutter.

This subclass is indented under subclass 52. Circuit-controllers are arranged to cooperate with the pointer of an indicating instrument or there is a common operator for the pointer and the circuit-controller.

SEE OR SEARCH CLASS:
73, Measuring and Testing, for most measuring instruments (see the Notes to that class for other measuring instrument classes) and for the combination of a Class 73 measuring instrument and a circuit controller wherein the circuit controller is claimed broadly (Class 200 subclass 56 provides for the combination when specific structure of the circuit controller is claimed).

This subclass is indented under subclass 52. Circuit controllers which are specially adapted for use with portable hand flashlights.

SEE OR SEARCH CLASS:
362, Illumination, subclasses 205+ for combinations of circuit controllers with portable self-contained electric lamp structures.

This subclass is indented under subclass 52. Circuit controllers especially adapted to be used with incubators and operated by the lever which controls the heater-damper.

SEE OR SEARCH CLASS:
119, Animal Husbandry, subclasses 318+ for incubator in combination with the switch.

This subclass is indented under subclass 52. Circuit controllers which are operatively responsive to compressional impulses propogated in an elastic medium.

This subclass is indented under subclass 52. Circuit controllers comprising means whose action is initiated by energy received from a source of illumination.
(1) Note. These devices for the most part comprise means initiated by photo- sensitive gases.

SEE OR SEARCH CLASS:
250, Radiant Energy, subclasses 200+ for photo cells, circuits and apparatus, and see (7) Note (Class 250, subclass 200) for a field of search for photocells, per se.
340, Communications: Electrical, subclass 600 for electric automatic radiant energy responsive indicating systems.

This subclass is indented under subclass 52. Circuit controllers comprising means whose action is initiated by the presence of non-liquid fluids including colloidal suspensions of solid particles in a gas.
(1) Note. These circuit controllers may involve mechanisms which become unbalanced as a result of exothermic reaction, breakdown of surface tension, or buoyancy due to the presence of the gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:
61.04 for liquid or moisture responsive devices.

SEE OR SEARCH CLASS:
340, Communications: Electrical, subclasses 628-634 for electric automatic gas or smoke responsive indicating systems.

This subclass is indented under subclass 52. Circuit controllers having means which become operative as a result of contact with nongaseous fluid(s) whose presence is merely Adventitious, or with vapor.

SEE OR SEARCH CLASS:
340, Communications: Electrical, subclasses 603+ for electric automatic fluent material responsive indicating systems.

This subclass is indented under subclass 61.04. Devices in which a circuit is completed by an electrolyte, that is, liquid bridges the gap between the electrical conductors.

This subclass is indented under subclass 61.04. Devices having hygroscopic means responsive to the presence of vapor in the atmosphere.

SEE OR SEARCH CLASS:
73, Measuring and Testing, subclass 29.02 for hygrometers and hygrostats.
236, Automatic Temperature and Humidity Regulation, subclass 44 for apparatus controlling the humidity of a room, etc., by means of a device responsive to the relative humidity therein.
340, Communications: Electrical, subclass 602 for electrical automatic moisture or humidity responsive indicating systems.

This subclass is indented under subclass 61.06. Devices in which a certain quantity of water taken up by the hygroscopic means causes operation of the circuit controller.

This subclass is indented under subclass 52. Current Conductors which become circuit interrupters or cut-outs by their destruction by other than thermal action.

SEE OR SEARCH CLASS:
337, Electricity: Electrothermally or Thermally Actuated Switches, appropriate subclasses for switches responsive to heat generated by current in the circuit or heat from some external source or a combination of both.

This subclass is indented under subclass 52. Circuit controllers which are responsive to the presence, in a particular zone, of metal articles or particles whose presence in that zone is not desired.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclass 204 for fluid material examination, and subclasses 228+ for testing material by means of a magnetic field.

This subclass is indented under subclass 52. Apparatus in which a propelled or independently movable element of a game or amusement device brings about the actuation of a switch by that element's contacting with, or proximity to, a switch part.

SEE OR SEARCH CLASS:
273, Amusement Devices: Games, subclasses 108+ and 317+ for game devices involving aerial and surface projectiles, and subclass 238 for removable and discrete game pieces which change the status of an electrical circuit located in a game
board.

This subclass is indented under subclass 61.1. Apparatus in which the propelled or independently movable element is a sphere.

SEE OR SEARCH CLASS:
273, Amusement Devices: Games, subclass 118 for game devices involving a ball rolling on a surface.

This subclass is indented under subclass 52. Circuit controllers responsive to a change in chain tension or direction of movement of the braking or driving mechanisms of velocipedes.

SEE OR SEARCH THIS CLASS, SUBCLASS:
61.39 for circuit makers and breakers controlled by direction of rotation of a shaft or spindle and not associated with a bicycle.

This subclass is indented under subclass 52. Circuit makers and breakers in which the operating mechanisms thereof are controlled by continuous or indefinite lengths of material such as motion picture film, rope, yarn, endless belts and the like, travelling in a given path or being wound onto or unwound from spools or reels.
(1) Note. For textile machines, including fiber preparation apparatus, which have an electrical switch controlled by a thread or strand, search the following classes liste