(under subclass 113) Subject matter including means for controlling the period of exposure of the light sensitive material.
(1) Note. Usually the means consists of a mechanism which closes a shutter after a predetermined period of time or which opens or closes the electrical circuit containing the light source after a predetermined period of time.
SEE OR SEARCH THIS CLASS, SUBCLASS:
35+, for multicolor projection printing or copying cameras with means to regulate the light intensity or exposure time.
83, for contact printers with light monitoring exposure control means.
