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| More topics under "H01 - Basic electric elements" (4,022,345) |
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| H01B - Cables; Conductors; Insulators; Selection of materials for their conductive, insulating or dielectric properties (169,443) | | H01C - Resistors (32,678) | | H01F - Magnets; Inductances; Transformers; Selection of materials for their magnetic properties (175,615) | | H01G - Capacitors; Capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices of the electrolytic type (69,512) | | H01H - Electric switches; Relays; Selectors; Emergency protective devices (249,286) | | H01J - Electric discharge tubes or discharge lamps (266,588) | | H01K - Electric incandescent lamps (12,967) | | H01L - Semiconductor devices; Electric solid state devices not otherwise provided for (1,785,137) | | H01M - Processes or means, e.g. batteries, for the direct conversion of chemical energy into electrical energy (431,305) | | H01P - Waveguides; Resonators, lines or other devices of the waveguide type (53,942) | | H01Q - Aerials (214,934) | | H01R - Electrically-conductive connections; Structural associations of a plurality of mutually-insulated electrical connecting elements; Coupling devices; Current collectors (427,500) | | H01S - Devices using stimulated emission (112,410) | | H01T - Spark gaps; Overvoltage arresters using spark gaps; Sparking plugs; Corona devices; Generating ions to be introduced into non-enclosed gases (21,028) |
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