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 [Search a list of Patent Appplications for class 219]   CLASS 219,ELECTRIC HEATING
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SECTION I - CLASS DEFINITION

This class includes all those devices commonly known as electric heaters, electric-heating metal working apparatus, electrically-heated tools and instruments. Processes are classified with the apparatus unless otherwise indicated by the subclass title.

This is the generic class for electric heating devices, per se. Devices and systems equipped with electric heating means in which the electric heating means is combined with or includes specific other art structure whereby the heated material is withdrawn, stored or otherwise utilized will be classified in the appropriate other art class to which it pertains and cross referenced back to Class 219.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

An example of other classes as mentioned above in the Class Definition is Class 122, Liquid Heaters and Vaporizers in which such terms as steam dome, super heaters, steam separators, condensers, traps, etc., are considered to be art structure over and beyond the mere heating of a liquid and comprising specific means for further storing or utilizing the liquid or vapor resulting from a heating step and sufficient to exclude the claimed subject matter from this class.

The liquid heaters to be found in this class, subclasses 281+ are very similar to those classified in Class 122 and in Class 126, subclasses 344+. The general line to be followed in distinguishing between this and those classes is as follows: Where the claims recite specific electrical means for heating a liquid only and the end result recited is a heated liquid only and no further means is claimed for withdrawing the liquid for further use the device will be considered a liquid heater for this class. For an understanding of the lines between Classes 122 and 126 consult the class definitions and the notes thereunder.

SECTION III - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

5Beds,   subclass 284 for bed structures with devices for heating or cooling of, and subclass 421 for devices for supporting bed clothing with heating means.
12Boot and Shoe Making,   subclass 1 for miscellaneous shoe machinery with heaters, subclasses 32.1, 33.2 and 41.5 for sole machines with electric heaters, subclasses 53.1, 53.3 and 69.7 for heel machines with electric heaters, subclass 78.5 for sole and/or heel burnishing machines with heating means, and subclasses 114.2, 114.6, 116.2, 117.4, and 129.4 for tools or forms used in shoe manufacturing with heating means.
15Brushing, Scrubbing, and General Cleaning,   subclass 1.5 for electrostatic cleaning, subclasses 300.1+ for cleaning by air blast or suction wherein the fluid may be heated and subclasses 104.001+ for implements which may be heated.
19Textiles: Fiber Preparation,   subclass .27 for drying apparatus.
26Textiles: Cloth Finishing,   subclasses 3+ for singeing devices which may utilize electric heating means.
30Cutlery,   subclass 32 for wire razor devices, subclasses 34.05+ for razors combined with heated blade, and subclass 42 for the combination where the blade is movable.
34Drying and Gas or Vapor Contact With Solids,   subclasses 519+ for processes which may utilize electric heaters particularly subclass 283 for drying the hair on the head and the subclasses under the title "Apparatus" for particular drying apparatus which may utilize electric heating means.
36Boots, Shoes, and Leggings,   subclass 2.6 for boots and shoes with heating means.
38Textiles: Ironing or Smoothing,   subclasses 74+ for flat irons which may include electrical heating devices by name only.
44Fuel and Related Compositions,   for pertinent subclass(es) as determined by schedule review.
48Gas: Heating and Illuminating,   subclass 65 for cupola gas generators wherein electric current is used for heating purposes, and subclass 103 for retorts in which is located an electric heater for gasifying the oil.
60Power Plants,   subclass 523 for a motor operated by the expansion and contraction of a unit mass where the expansion is caused by an electrical heating means.
62Refrigeration,   particularly subclasses 148 , 159+, 167, 238, 275+, 324+, and 351 for heating means associated with refrigeration apparatus.
65Glass Manufacturing,   appropriate subclasses for glass working apparatus utilizing electrical heating means particularly subclass 40 for means employing dielectric or joule effects and subclasses 152+ for fusion bonding devices.
70Locks,   appropriate subclasses for heater lock combinations according to the particular lock structure.
72Metal Deforming,   appropriate subclasses for heating metal by a means other than electricity and deforming it.
73Measuring and Testing,   appropriate subclasses for measuring or testing devices with electrical heating means for testing purposes or for maintaining constant temperature.
75Specialized 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.
81Tools,   appropriate subclasses for particular tool structure which may be combined with heating means.
83Cutting,   subclasses 170+ for cutting apparatus combined with means to modify or control the temperature of the apparatus or work.
96Gas Separation: Apparatus,   appropriate subclasses, for gas separation apparatus having heating or cooling means.
99Foods and Beverages: Apparatus,   takes food support means, peculiar to a food, shape, or condition, (e.g., can, jar, bottle, or slice holders, spits, griddles, waffle irons, sandwich grills, article confining or conforming supports), including a mechanism for manipulating food during cooking, other than mere agitation or stirring (e.g., conveying or bodily moving), or including a mechanism for treating food (e.g., basting, compressing, molding, drip, or gravy segregating), and, in any case, irrespective of whether or not a heat, steam, or vapor generator or enclosure is claimed; subclasses 324+ for cooking apparatus.
100Presses,   subclasses 92+ for a press having an additional heating, cooling, or drying means to treat material or subclass 102 for a press that may be combined with an electrical heating means.
101Printing,   see subclasses 3.1+ , especially subclasses 8, 9+, 21, 25, 27, and 31 for embossing or penetrating devices utilizing heated dies.
104Railways,   subclass 15 for electric welders for track joints and subclass 279 for track clearing devices comprising rail heaters.
105Railway Rolling Stock,   especially subclass 451 for heating devices which may be electrical.
110Furnaces,   subclass 194 for cremation apparatus that may utilize electric heating means; and subclass 250 for a refuse incinerator provided with an electric heater.
118Coating Apparatus,   appropriate subclasses, especially subclass 47 for coating burning apparatus, and subclasses 50.1, 58+, 620+, 663+, and 723+ for coating devices with means for applying electrical or radiant energy to work and or coating material, particularly subclasses 641+ for radiant heating devices.
119Animal Husbandry,   subclasses 308+ for a brooder warmed by an electrical component, or subclasses 318+ for an incubator warmed by an electrical component.
122Liquid Heaters and Vaporizers,   appropriate subclasses for steam generating devices which may utilize electric heating means.
123Internal-Combustion Engines,   particularly subclasses 543+ for means for heating the carburetor, subclass 142.5 for the combination of an internal combustion engine combined with external heating means for heating the engine or some adjunct thereof and subclass 145 for incandescent igniters.
126Stoves and Furnaces,   appropriate subclasses for structural features peculiar to stoves and furnaces, see particularly subclass 273.5 for domestic ovens with heat accumulators and subclass 400 for heat accumulators, per se.
128Surgery,   appropriate subclasses for various instruments combined with heating means or designed for the utilization of heat energy for therapeutic treatment of the human body.
131Tobacco,   subclass 185 for tobacco users" appliances with igniter means.
132Toilet,   subclass 7 for methods of hair treating comprising permanent waving with heat and subclass 118 for hair combs with heaters and subclass 148 for combs combined with other features; see also subclasses 31+ for hair crimpers or curlers which may include heaters.
134Cleaning and Liquid Contact With Solids,   subclasses 105+ for apparatus with heating, cooling or heat exchange means.
136Batteries: Thermoelectric and Photoelectric,   for batteries in that class having heating means.
137Fluid Handling,   subclass 341 for electric heating means for the system.
138Pipes and Tubular Conduits,   subclass 33 for electric thawing or freeze protection means therefor.
140Wireworking,   subclass 112 for processes for joining of wires by electric welding.
141Fluent Material Handling, With Receiver or Receiver Coacting Means,   subclass 82 for the treatment of material by heating or cooling.
148Metal Treatment,   particularly subclasses 520 , 525, and 565 for processes of significant heat treatment of metal to modify or maintain the internal physical structure (i.e., microstructure) or chemical property of metal wherein electrical heating is utilized. See Lines With Other Classes, "Metal Casing, Metal Fusion Bonding, Machining, or Working Classes" to determine what constitutes significant heat treatment.
164Metal Founding,   appropriate subclasses for metal casting apparatus which may employ an electric heater.
165Heat Exchange,   appropriate subclasses for systems comprising both heating and cooling means or heat transfer, particularly subclasses 200+ for automatic control; subclass 42 for vehicle heating and cooling and subclasses 47+ for structural installations such as radiant building panels.
166Wells,   subclass 60 for well structure with an electric heater in the well.
174Electricity: Conductors and Insulators,   appropriate subclasses for insulator devices and structural details of electrical conductors, per se.
175Boring or Penetrating the Earth,   subclass 16 for an electrical heating process or device for forming a hole in the earth by directly applying heat to fluidize or comminute the material forming the earth. (See Lines With Other Classes and Within This Class, in the class definition of Class 175 for the line between Class 175 and Class 219).
178Telegraphy,   subclass 94 for pyros:graphic code recorders.
184Lubrication,   subclass 104 for heating and cooling devices for lubricators.
191Electricity: Transmission to Vehicles,   subclass 62 for trolley heads with heated ice clearers or preventers.
196Mineral Oils: Apparatus,   subclass 121 for vaporizing devices with electric heating means.
200Electricity: Circuit Makers and Breakers,   for generic circuit maker and breaker structure, or subclasses 308+ for an electrical switch having indicator means.
201Distillation: Processes, Thermolytic,   subclass 19 for a thermolytic distillation in which electrical energy is applied.
204Chemistry: Electrical and Wave Energy,   particularly subclasses 210 , 236, 239, 241, 262, and 274 for electrolytic apparatus utilizing heating or cooling means.
210Liquid Purification or Separation,   subclasses 175+ for devices with heating or heat exchange means.
216Etching a Substrate: Processes,   with the use of a plasma, note subclasses 67+ . The use of a cold plasma, which is a chemical reaction involving reactive ions and an article or substrate is not proper for Class 219, Electric Heating. However, cold plasma is proper for Class 216, Etching a Substrate: Processes. The use of a high temperature thermal plasma which removes or alters material by thermal means is proper for Class 219, Electric Heating.
221Article Dispensing,   subclass 143 for dispensing devices with electrical ignition means and subclass 150 for such devices with article treatment involving heating or cooling.
222Dispensing,   subclass 146 for dispensers with heating or cooling.
223Apparel Apparatus,   subclass 26 for heated hat forms, subclasses 51, 70, 73, and 76 for apparatus including heating and steaming means and subclass 79 for heated glove forms.
236Automatic Temperature and Humidity Regulation,   appropriate subclass for heating systems beyond the scope of Class 219 and involving automatic temperature control devices.
237Heating Systems,   appropriate subclasses for complete heating systems in which the heat source may be electrical.
239Fluid Sprinkling, Spraying, and Diffusing,   subclasses 128+ for heating or cooling means for the fluid or system.
244Aeronautics and Astronautics,   subclass 134 for ice prevention devices utilizing electric heating means.
250Radiant Energy,   subclasses 316+ for infrared or thermal pattern recorders or document copiers, subclass 337 for a radiant energy electric signalling device responsive to luminous energy emitted from a heated luminophor irradiated by invisible radiation subclass 352 but conduction to or from some part of an infrared responsive electric signalling means, subclass 429 for temperature control of contained supported transferred fluent material, subclass 443.1 for a support for an object to be irradiated with charged particles with heat transfer to or from the object, and subclass 495.1 for plural invisible radiation sources including an infrared source, subclass 504 for an infraradiation source with a radiation modifying member and subclass 238 for photocells with temperature control.
261Gas and Liquid Contact Apparatus,   subclasses 139 and 142 for such apparatus with an electrical external heat supply.
266Metallurgical Apparatus,   appropriate subclasses for such apparatus with electrical heating devices.
285Pipe Joints or Couplings,   subclass 41 for such devices with heating or cooling means.
290Prime-Mover Dynamo Plants,   for prime mover dynamo plants for producing heat.
307Electrical Transmission or Interconnection Systems,   subclasses 112+ for a residual switching system.
310Electrical Generator or Motor Structure,   subclasses 341+ for piezoelectric crystals with temperature control means in which electrical circuit connections and the crystal are claimed.
312Supports: Cabinet Structure,   subclass 236 for such structures with heating, cooling or heat exchange means.
313Electric Lamp and Discharge Devices,   appropriate subclasses for electric lamp, filament or cathode heaters, particularly subclasses 11+ including indented subclass 14 for pyroelectric devices and subclasses 15+ for such devices with electric heater temperature modifier means.
314Electric Lamp and Discharge Devices: Consumable Electrodes,   particularly subclasses 26+ for such devices with temperature modifying means.
315Electric Lamp and Discharge Devices: Systems,   particularly subclasses 46+ 49, 50, 94+, and 112+ for systems with heated filaments, cathodes or device temperature modifiers.
323Electricity: Power Supply or Regulation Systems,   for a generic class of electrical systems wherein a single electrical source is coupled to a single electrical load circuit and means are provided which control the magnitude or level of the current or voltage of either or both of said circuits, especially subclass 236 for other than an electrical zero switching output level condition responsive (e.g., heat, etc.) circuit.
331Oscillators,   subclass 70 for oscillator with temperature modifier.
336Inductor Devices,   subclasses 55+ for inductors with temperature modifiers.
337Electricity: Electrothermally or Thermally Actuated Switches,   appropriate subclasses for specific switch structure with thermal actuating means.
338Electrical Resistors,   appropriate subclasses for electrical resistors, per se. The mere claiming of a resistor having a heat insulating or heat conducting casing or housing does not exclude Class 338. However, as between Classes 219 and 338 the combination of a resistor used for heating purposes surrounded or incased by the structure to be heated or a resistor with structure or configuration for distributing, directing or concentrating the heat produced by the resistance is classified in this class (219), especially subclasses 200+ . See also Lines With Other Classes and Within This Class, "Electrical Resistance Heaters," in the class definition of Class 338 for a more detailed treatment of the line between the two classes.
340Communications: Electrical,   subclasses 309.16 through 309.9for a timer controlled system; subclasses 384.1-404.3 for an audible signaling device, especially subclass 387.1 for weatherproofing (e.g., means to melt sleet off of a signal device, etc.); subclasses 577-579 for a flame condition responsive system; subclasses 584-599 for a thermal condition responsive system; subclass 600 for radiant energy condition responsive system; subclasses 635-656 for electrical apparatus condition responsive system, especially subclass 640 for a heater element condition responsive system and subclass 655 for a condition responsive system indicating heating circuit energization; subclasses 815.4-815.92 for visual indication systems or subclasses 825-825.98 for miscellaneous remote control systems.
343Communications: Radio Wave Antennas,   subclass 704 for antennas with ice clearer or preventers which may utilize electric heaters.
346Recorders,   subclass 76.1 for thermal recording of phenomenon.
347Incremental Printing of Symbolic Information,   subclasses 171.1+ for thermal marking processes or apparatus.
355Photocopying,   subclasses 3+ for electrophotography devices utilizing heating means.
361Electricity: Electrical Systems and Devices,   subclasses 1+ for safety and protection of systems and devices; indented subclasses 24, 25+, 32, 34, 37, and 103+ provide thermal sensing devices in various circuits or systems; subclasses 99 and 211 for combinations including thermal relays and control circuits for thermal relays; subclass 158 for thermal indicating instrument; subclasses 161+ for control circuits including a thermal device and subclasses 247+ for igniting systems.
362Illumination,   subclasses 92+ for the combination of illuminating means and a heating device.
373Industrial Electric Heating Furnaces,   for furnaces which are especially adapted to metallurgical and related work. Such furnaces are generally characterized by electrical heating means within the chamber containing the material to be heated, the heating means being either an arc, a resistance, the material itself or a combination of such means and are further characterized by adaptation for operation on a granular material, such as crushed ore or for handling molten material fusing at a very high temperature, the material in both cases being received immediately within the body of the furnace.
374Thermal Measuring and Testing,   including electric heating arrangements to perfect a measurement or test or to maintain a constant temperature.
401Coating Implements With Material Supply,   subclasses 1+ for a hand-manipulated coating implement with means to heat the material supply contained therein.
405Hydraulic and Earth Engineering,   subclasses 56 and 131 for devices for heating the earth which may use electrical heating means; and subclass 234 for a heating means employed in the installation of piling.
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 21 and 22+ for processes of sterilizing with electric energy subclasses 186.19 and 186.2 for radiant energy chemical reactors with heating or cooling means; and subclasses 242 and 295+ for autoclaves.
425Plastic Article or Earthenware Shaping or Treating: Apparatus,   appropriate subclasses for a molding machine for shaping or reshaping nonmetals combined with means to heat or cool, see subclass 407 and the search notes thereunder.
427Coating Processes,   subclasses 457+ for coating processes utilizing direct application of electrical magnetic, wave, or particulate energy.
429Chemistry: Electrical Current Producing Apparatus, Product, and Process,   subclass 62 for battery having a temperature control and subclass 120 for battery having heat exchange feature.
431Combustion,   subclasses 258+ for a burner having an electrical heater or igniter.
432Heating,   appropriate subclass for a residual heating apparatus that may include a broadly recited electrical heater as a source of heat.
452Butchering,   subclass 73 for hot wire singers for fowl.
454Ventilation,   especially subclasses 83 , 93, 121+, and 198 for condensation prevention devices which may use hot or heated air blown on a window or windshield.
606Surgery,   subclass 2.5 for subject matter relating to removal of a calculus (e.g., stone) from the body wherein the calculus is fractured or disintegrated by use of light energy.
901Robots,   subcollection 10 for a robot arm in which a sensor physically contacts and follows the work contour to control the arm movement and subcollection 42 for an art collection of welding robots.
D23Environmental Heating and Cooling; Fluid Handling and Sanitary Equipment,   subclasses 314+ for heating equipment.

SUBCLASSES

[List of Patents for class 219 subclass 50]    50METAL HEATING (E.G., RESISTANCE HEATING):
 This subclass is indented under the class definition.  Subject matter relating to the electrical heating of metal.
(1) Note. The heating in this and indented subclasses is often, but not necessarily, accompanied by working of the metal.
(2) Note. The metal heated is a workpiece and is separable and distinct from the heater, which is a tool. However, heat may be developed within the metal by the passage of electric current.
(3) Note. The heating may be for welding, brazing, soldering, heat treating or other purpose.
(4) Note. The art in miscellaneous subclass 50 relates, for example, to mere heating of metal by the passing of an electric current through it.
(5) Note. Subclasses 7.5, 8.5, 9.5, and 50 to 162 were formed in 1956 by making official some unofficial digests which had been established during the previous two decades by the Examiners of Divisions 37 and 60. A caveat is given: While it is believed that the titles and definitions are reasonably correct, no assurance can be given that all of the patents, issued prior to the date of reclassification, are in the proper subclass, since the individual patents were not read during the reclassification project. Consequently, in making a thorough search in these subclasses, it is advisable to investigate every subclass which may possibly be pertinent and not, in order to shorten the search, to rely upon the principle of superiority of subclass subject matter because of position in the schedule, since the principle is applicable only in classes where each patent has been analyzed and placed in the schedule in accordance with that portion of the disclosed subject matter which is claimed.

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600+,for this subject matter where the heating is inductive heating.
678+,for microwave heating.
764+,for capacitive dielectric heating.

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148Metal Treatment,   particularly subclasses 520 , 525, and 565 for processes of significant heat treatment of metal to modify or maintain the internal physical structure (i.e., microstructure) or chemical property of metal wherein electrical heating is utilized. See Lines With Other Classes, "Metal Casing, Metal Fusion Bonding, Machining, or Working Classes" to determine what constitutes significant heat treatment.
373Industrial Electric Heating Furnaces,   appropriate subclasses where the metal is heated in an electric furnace.
428Stock Material or Miscellaneous Articles,   subclass 934 for metallic stock produced by an electrical process, and subclass 939 for stock having a molten or fused coating.
483Tool Changing,   generally for a process or apparatus including a tool transfer means combined with either a tool support or storage means. A process or apparatus for electric heating wherein the sole significantly recited feature is changing a tool (e.g., a nonconsumable electrode) is properly classified in Class 483, and may be cross referenced into this class (Class 219, Electric Heating).
  
[List of Patents for class 219 subclass 51]    51Chain:
 This subclass is indented under subclass 50.  Subject matter relating to the manufacture of chain link.

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59Chain, Staple, and Horseshoe Making,   subclasses 1+ , and the search notes thereto, for miscellaneous chain making, not involving significant electric heating.
  
[List of Patents for class 219 subclass 52]    52Methods:
 This subclass is indented under subclass 51.  Methods.
  
[List of Patents for class 219 subclass 53]    53Rail bond:
 This subclass is indented under subclass 50.  Subject matter relating to the making of rail bonds.
(1) Note. The bond may be for the purpose of furnishing a low resistance electrical shunt around the mechanical joint between rail sections of a railroad track or it may be for the purpose of mechanically uniting rail sections.
  
[List of Patents for class 219 subclass 54]    54Arc weld:
 This subclass is indented under subclass 53.  Subject matter in which the rail bond is made by means of an arc weld.
  
[List of Patents for class 219 subclass 55]    55Resistance weld methods:
 This subclass is indented under subclass 53.  Subject matter relating to resistance welding methods.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53,for resistance welding apparatus for making rail bonds.
  
[List of Patents for class 219 subclass 56]    56Wire, rod, or bar bonding:
 This subclass is indented under subclass 50.  Subject matter relating to the bonding of wire or bar.
(1) Note. The wire, for example, may be part of a fabric mesh, or the bar may form a grating or a metal window.

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156,for mere electric heating of rods or bars.

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140Wireworking,   subclass 112 for this subject matter not having significant welding.
  
[List of Patents for class 219 subclass 56.1]    56.1Of wire leads:
 This subclass is indented under subclass 56.  Subject matter wherein the wire is connected to or from a circuit element.
  
[List of Patents for class 219 subclass 56.21]    56.21By microbonding:
 This subclass is indented under subclass 56.1.  Subject matter wherein the bonding is produced between miniature or microminiature workpieces.
  
[List of Patents for class 219 subclass 56.22]    56.22Methods:
 This subclass is indented under subclass 56.1.  Subject matter including processes of bonding wire leads.
  
[List of Patents for class 219 subclass 57]    57Butt bonding (e.g., welding):
 This subclass is indented under subclass 56.  Subject matter relating to butt bonding.

SEE OR SEARCH THIS CLASS, SUBCLASS:

101,for miscellaneous butt bonding.
  
[List of Patents for class 219 subclass 58]    58Methods:
 This subclass is indented under subclass 56.  Methods.
  
[List of Patents for class 219 subclass 59.1]    59.1Of cylinders (e.g., pipes and tubes):
 This subclass is indented under subclass 50.  Subject matter relating to the bonding of a seam of a cylinder.
(1) Note. The seam may be helical, as in indented subclass 62.

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101+,for resistance butt bonding of cylindrical shaped tubing.
607+,for this subject matter where the heating is inductive.

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413Sheet Metal Container Making,   subclasses 58+ for the longitudinal seaming of containers, such as cans, where no significant electric heating is involved.
  
[List of Patents for class 219 subclass 60]    60Electric arc:
 This subclass is indented under subclass 59.1.  Subject matter in which the bonding is accomplished by an electric arc.
  
[List of Patents for class 219 subclass 60.2]    60.2Tube sheet welding:
 This subclass is indented under subclass 60.  Subject matter wherein heat exchange tubes are arc butt welded to a perforated plate.
  
[List of Patents for class 219 subclass 61]    61Methods:
 This subclass is indented under subclass 60.  Methods.
  
[List of Patents for class 219 subclass 61.1]    61.1Having internal support means:
 This subclass is indented under subclass 59.1.  Subject matter including support means for the cylinder, positioned inside the cylinder during the welding process.
  
[List of Patents for class 219 subclass 61.11]    61.11With forming means:
 This subclass is indented under subclass 61.1.  Subject matter including means for shaping the workpiece.

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78.16,for tube sealing apparatus.
91.23,for tube sealing methods.
  
[List of Patents for class 219 subclass 61.12]    61.12With cleaning means:
 This subclass is indented under subclass 61.1.  Subject matter including means to remove excess or undesirable material from the work.

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78.14,for work cleaning in bonding with pressure.
  
[List of Patents for class 219 subclass 61.13]    61.13With edge guidance means:
 This subclass is indented under subclass 61.1.  Subject matter including means to direct the path of the edges to be welded through the welding process.

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61.3,for edge guidance subject matter without cylinder internal support means.
  
[List of Patents for class 219 subclass 61.2]    61.2Utilizing high frequency resistance heating:
 This subclass is indented under subclass 59.1.  Subject matter wherein the welding apparatus is operated by high frequency current.
  
[List of Patents for class 219 subclass 61.3]    61.3With edge guidance means:
 This subclass is indented under subclass 59.1.  Subject matter including means to direct the path of the workpiece edges through the welding process.

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61.13,for this subject matter along with cylinder internal support means.
  
[List of Patents for class 219 subclass 61.4]    61.4With adjustable electrode means:
 This subclass is indented under subclass 59.1.  Subject matter including means to change the position of an electrode used in the welding process.

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86.33+,for spot bonding adjustable electrodes.
86.8,for interchangeable electrodes.
88,for positioning an electrode along a bus bar.
  
[List of Patents for class 219 subclass 61.5]    61.5With condition responsive control of the welding process:
 This subclass is indented under subclass 59.1.  Subject matter wherein the control means of the welding apparatus responds to a sensed condition.

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86.41+,for spot bonding with electrode condition responsive control means.
91.1,for spot bonding with condition responsive control means.
124.1+,for automatic positioning of an arc.
  
[List of Patents for class 219 subclass 61.6]    61.6Using three or more electrodes:
 This subclass is indented under subclass 59.1.  Subject matter including the use of three or more electrodes in the welding process.
  
[List of Patents for class 219 subclass 61.7]    61.7With cooling means:
 This subclass is indented under subclass 59.1.  Subject matter including means to maintain or lower the temperature of part or all of the welding apparatus or work.

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76.11,for deposition welding with cooling means.
86.31,for spot bonding electrode support with cooling means.
137.62,for consumable electrode gun with cooling means.
  
[List of Patents for class 219 subclass 62]    62Helical seam:
 This subclass is indented under subclass 59.1.