US PATENT SUBCLASS 352 / 150
.~.~ Film tension responsive

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.~.~ Film tension responsive {1}
151  DF  .~.~.~> Slack loop actuation

DEFINITION

Classification: 352/150

(under subclass 149) Subject matter including means to actuate the fire shutter upon sensing a variation in film tension from the normal tension of the film.