(under subclass 461) Subject matter in which the screen includes means to regulate the amount of light which can pass through it; the regulation of the light transmissibility of the screen being controlled by the cathode ray.
SEE OR SEARCH THIS CLASS, SUBCLASS:
117, for other devices under the class definition which have structurally combined therewith a light valve.
SEE OR SEARCH CLASS
348, Television,
744+, for television projection devices that may use a cathode-ray beam to regulate the light transmissibility of a screen, which screen regulates the amount of light transmitted. 359, Optics: Systems (Including Communication) and Elements,
