(under the class definition) Subject matter involving the structure of any amplifier circuit element, such as resistors, vacuum tubes, etc.., with the exception of the structure of transformer elements, or of the structural relationships of such elements in the amplifier.
(1) Note. The term structure, herein, refers to the arrangement in space of the parts to the whole of the circuit element or of the elements comprising the amplifier which includes also the material of which such parts are constructed. The term structure is distinguished from circuit or circuit arrangement in that the latter refers to an abstract schematic of parts identified broadly by their function in the circuit and arranged according to the sequence of signal current flow and not according to actual arrangement in space, or construction.
(2) Note. Subject matter involving the structure of transformers is not classified in this or indented subclasses but in subclasses 171, 190, or 197 below.
(3) Note. Subject matter involving the structure of any amplifying device or associated therewith, of the types specifically provided for above are not classified in this or indented subclasses but in the appropriate subclasses for those types, above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53+, for amplifiers having distributed parameter coupling means including the structure of such distributed parameter means.
SEE OR SEARCH CLASS
174, Electricity: Conductors and Insulators, for the structure of electrical insulators and conductors.
200, Electricity: Circuit Makers and Breakers, for the structure of switches and circuit breakers.
313, Electric Lamp and Discharge Devices, appropriate subclasses for the structure of electric discharge devices (vacuum tubes and gas tubes), per se.
315, Electric Lamp and Discharge Devices: Systems,
3+, for combined cathode-ray tube and circuit element structure, subclasses 32+ for vacuum or gas tubes combined with integral circuit structure or temperature modifying means structure where the tube is the load device.
334, Tuners, appropriate subclasses for tuners, per se.
336, Inductor Devices, appropriate subclasses for inductor structure.
338, Electrical Resistors, for the structure of resistors and rheostats.
361, Electricity: Electrical Systems and Devices,
271+, for capacitor structure, subclasses 600+ for housing and mounting assemblies with plural diverse electrical components, subclasses 679+ for electronic systems and devices, and subclasses 500+ for electrolytic capacitors.
439, Electrical Connectors, appropriate subclasses for the structure of electrical connectors. 455, Telecommunications,
130+, for radio receiver structure in general; and subclass 351 for portable radio receivers.
