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

DEFINITION

Classification: 352/152

(under subclass 149) Subject matter including means to actuate the fire shutter in response to the rate of travel of the motion picture film strip.