US PATENT SUBCLASS 352 / 155
.~ Electrical circuit interrupted by film sensing means

Current as of: June, 1999
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352 /   HD   OPTICS: MOTION PICTURES

143  DF  WITH FILM STRIP FIRE PREVENTION OR ISOLATION {4}
155.~ Electrical circuit interrupted by film sensing means

DEFINITION

Classification: 352/155

(under subclass 143) Subject matter including means which operates an electrical switch in the motor or lamp circuit in a motion picture projector in response to a malfunction of the drive mechanism or to film breakage.