Electricity

	No:330 - Amplifiers (258)
	No:381 - Electrical audio signal processing systems and devices (286)
	No:439 - Electrical connectors (986)
	No:310 - Electrical generator or motor structure (511)
	No:377 - Electrical pulse counters, pulse dividers, or shift registers: circuits and systems (138)
	No:338 - Electrical resistors (342)
	No:307 - Electrical transmission or interconnection systems (203)
	No:219 - Electric heating (780)
	No:320 - Electricity: battery or capacitor charging or discharging (78)
	No:200 - Electricity: circuit makers and breakers (728)
	No:174 - Electricity: conductors and insulators (492)
	No:361 - Electricity: electrical systems and devices (673)
	No:337 - Electricity: electrothermally or thermally actuated switches (420)
	No:335 - Electricity: magnetically operated switches, magnets, and electromagnets (309)
	No:324 - Electricity: measuring and testing (660)
	No:318 - Electricity: motive power systems (672)
	No:388 - Electricity: motor control systems (99)
	No:323 - Electricity: power supply or regulation systems (196)
	No:322 - Electricity: single generator systems (104)
	No:191 - Electricity: transmission to vehicles (125)
	No:313 - Electric lamp and discharge devices (569)
	No:314 - Electric lamp and discharge devices: consumable electrodes (141)
	No:315 - Electric lamp and discharge devices: systems (518)
	No:445 - Electric lamp or space discharge component or device manufacturing (92)
	No:363 - Electric power conversion systems (222)
	No:392 - Electric resistance heating devices (209)
	No:399 - Electrophotography (417)
	No:218 - High-voltage switches with arc preventing or extinguishing devices (161)
	No:336 - Inductor devices (142)
	No:D26 - Lighting (158)
	No:327 - Miscellaneous active electrical nonlinear devices, circuits, and systems (610)
	No:332 - Modulators (90)
	No:290 - Prime-mover dynamo plants (95)
	No:220 - Receptacles (777)
	No:333 - Wave transmission lines and networks (225)
	No:140 - Wireworking (161)