(under subclass 218) Subject matter including a plurality of light responsive devices.
(1) Note. The detectors may be simultaneously or selectively operable.
SEE OR SEARCH THIS CLASS, SUBCLASS:
221, for photometers having plural detectors responsive to incident or diffused back lighting.
SEE OR SEARCH CLASS
250, Radiant Energy,
208.1+, for photocell circuits which include plural photocells, and subclass 578 for optical or pre-photocell systems with plural photosensitive elements.
