(under the class definition) Subject matter wherein the amplifier is combined with other devices or structures having an added purpose or independent utility, other than to perfect the amplifier, and in which the utility of the art device is not destroyed by removal of the amplifier and which combination is not provided for elsewhere.
(1) Note. An example of art classifiable in this class and subclass is an amplifier combined with an automobile accelerator pedal to control the volume of the amplifier. The removal of the amplifier does not destroy the utility of the accelerator pedal (as it would in case of a radio receiver which included the amplifier or a part thereof).
(2) Note. Subject matter in which a source is claimed by name only as a specific art device, as for example, a microphone, is classified with the specific art device and not with amplifiers. Subject matter, in which the signal source device may be broadly claimed, not by name, but by some distinctive identifying feature thereof as, where a microphone source is claimed as a "means for converting sound signals", is not classified with amplifiers, but with the distinctive art device.
(3) Note. The terms generator or oscillator in claims, where they appear as sources of signal energy without further qualification except by their electrical characteristics such as impedance, reactance, etc.., are treated as generalized sources of signal energy and classification is with amplifiers except where specific details of the generator or oscillator are claimed; in such cases, classification is with the type of generator claimed or with oscillators in Class 331.
(4) Note. Where the load is claimed, even broadly, or by name only as a specific electrical art device, as for example, a loudspeaker, classification is not in this class, but with the load art device claimed. Where characteristics of the load device are claimed, which are peculiar to the disclosed electrical art device or to a specific type of electrical art device, classification is with the load art device established in the claim.
(5) Note. Subject matter wherein general electrical characteristics of the load are claimed, as for example, "a load having a variable impedance", is classified in this class.
