US PATENT SUBCLASS 352 / 153
.~.~.~ Friction drive 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}
152  DF  .~.~ Feed speed responsive {2}
153.~.~.~ Friction drive actuation

DEFINITION

Classification: 352/153

(under subclass 152) Subject matter in which the actuation of the fire shutter in response to the velocity of the film feed is through a frictional coupling driven by the film strip as it is advanced.