1
Roger W Coomer, Ray L Marquis, Frank H Beckman: Self-threading motion picture projector. Kalart Victor Corporation, Hane Baxley & Spiecens, November 23, 1976: US03993404 (2 worldwide citation)

There is disclosed a motion picture projector with self-threading mechanism with which has been combined automatic electric clutch and brake means for forward and reverse operations to permit the projector to be used in a search mode, an automatic film tension control means, an automatic lower-loop ...


2
Ray L Marquis, Frank H Beckman: Variable torque electric clutch and brake. Kalart Victor Corporation, Hane Baxley & Spiecens, June 8, 1976: US03961692 (1 worldwide citation)

In a magnetic clutch a rotatable axially transferrable input disc which is part of a magnetic flux path including a magnetic cup in the output structure, engages annular friction surfaces on the output structure when magnetic flux is generated in the flux path by a coil. The friction surfaces are pa ...