(1) Excludes holder such as box, mount, etc.; see subclass 119.
(2) Includes letter or numeral.
(3) Includes "power supply". For diode or vacuum tube, see subclass 180.
(4) Includes jumper cable set.
(5) Includes rheostat.
(6) For coil, see subclass 117. For wire, see subclass 153.
(7) For insulated wire, or wire cladding, see subclass 153.
(8) Helical attachment provision not considered.
(9) Includes mirror image symmetry. Helical attachment provision not considered.
(10) Includes grounding bar. For battery connector, see subclass 120.
(11) For plug combined with receptacle, see subclass 137.1+.
(12) Includes covered receptacle where receptacle, per se, is invisible. For receptacle combined with plug, see subclass 137.1+.
(13) Faceplate excluded. For receptacle combined with faceplate, see subclass 139.1.
(14) For surge suppressor or circuit breaker, see subclass 160.
(15) For biased engagement, see earlier subclasses.
(16) For control panel or switch panel see, respectively, subclasses 162+ and 158+.
(17) For cable marker, see subclass 157; For duct or channel, see subclass 155.
(18) For general purpose control panel or module, see subclass 162. For rheostat, see subclass 125.
(19) If control element such as switch, knob or lever is not disclosed, article is considered to be an element and is therefore classified in subclasses 173+. For combination with receptacle, see subclass 142.
(20) Includes bolder or block.
(21) Includes photocell or receiver unit, per se.
(22) If control element such as switch, knob, lever, etc. , is disclosed, article is considered to be a switch, per se, and is therefore classified above. For escutcheon, see D8-350+.
(23) Includes diode. Includes magnetron.
(24) Includes circuit board.
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