(under subclass 524) Subject matter wherein a particular circuit includes a space discharge device of special tube construction or electrode arrangement.
(1) Note. This subclass and the intended subclasses will include structures of the tube wherein a plurality of groups of electrodes are contained in a single envelope, provided that there is one input circuit and one output circuit and the entire assembly acts as a single tube.
(2) Note. For subject matter comprehending structural features of electrical lamp and discharge devices with no significant control circuit means, the search will extend to Class 313, Electric Lamp and Discharge Devices. For subject matter comprehending special types of electric lamp and space discharge devices combined with control circuits whereby the conductive condition of the device is determined and wherein no load is included, the search will extend to Class 315, Electric Lamp and Discharge Devices: Systems.
SEE OR SEARCH CLASS
313, Electric Lamp and Discharge Devices, for the structure of space discharge device, see (2) Note.
315, Electric Lamp and Discharge Devices: Systems,
3+, and 32+ for combined tube and circuit element structure, see (2) Note.
330, Amplifiers, 3, 41, 42, 43, 44+, 47+, 49, and 64 for amplifier systems utilizing tubes of a particular construction.
331, Oscillators,
5, 6+, 79+, 86+, 103, 126+, and 184 for oscillator systems utilizing tubes of a particular construction.
332, Modulators,
165+, for modulator systems utilizing tubes of a particular construction.
