(under the class definition) Subject matter including means controlled by light or activated by light which may be involved in the amplifying device, per se, used as a control means, or which may be included in any other part of the amplifier.
(1) Note. Subject matter wherein light controlled or activated means is not a part of the amplifier but is combined therewith (as for example, as a photo-electric cell with light means therein feeding a signal current to a vacuum tube amplifier) is not classified in this class.
SEE OR SEARCH THIS CLASS, SUBCLASS:
308, for amplifiers having atomic particle or radiant energy impinging on a semiconductor amplifying device. See the search notes thereunder.
SEE OR SEARCH CLASS
250, Radiant Energy,
200+, appropriate subclasses for photocell circuits. See also the notes and search notes under subclass 200.
