US PATENT SUBCLASS 352 / 151
.~.~.~ Slack loop actuation

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

143  DF  WITH FILM STRIP FIRE PREVENTION OR ISOLATION {4}
149  DF  .~ Auxiliary fire shutter {2}
150  DF  .~.~ Film tension responsive {1}
151.~.~.~ Slack loop actuation

DEFINITION

Classification: 352/151

(under subclass 150) Subject matter where the sensing of the film tension includes means to detect a variation in size or position of the untensioned portion of the film strip.