(under the class definition) Subject matter including means to interrupt the light from the lamp in the projector, usually during movement or changing of the picture carrier.
SEE OR SEARCH CLASS
352, Optics: Motion Pictures,
204+, for motion-picture shutters.
355, Photocopying,
71, for a projection printer having a shutter, diaphragm, polarizer or filter.
359, Optics: Systems (Including Communication) and Elements, 738+, for lenses combined with such shutters or diaphragms and subclasses 227+ for shutters or diaphragms, per se.
