(under subclass 200) Subject matter having a photocell means which detects a light source wherein the light from the source is generated by means of a material being consumed.
(1) Note. The combination does not involve the testing of materials.
SEE OR SEARCH THIS CLASS, SUBCLASS:
336.1, for devices in which a photocell means detects invisible radiant energy.
SEE OR SEARCH CLASS
356, Optics: Measuring and Testing, 74+, for the examination of or testing of a substance by means of light. Included here are spectroscopes.
