US PATENT SUBCLASS 352 / 146
.~ Film cooling

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

143  DF  WITH FILM STRIP FIRE PREVENTION OR ISOLATION {4}
146.~ Film cooling {2}
147  DF  .~.~> Single frame projection
148  DF  .~.~> By filters

DEFINITION

Classification: 352/146

(under subclass 143) Subject matter with provision for reducing the temperature of the film strip in the projection gate.