Combined motion picture projector and sound reproducing machine
US1862342A
Control circuits for fire prevention apparatus
ES113661A1
Devices to prevent fires in animated image projection devices.
ES113660A1
Shutter control mechanism in cinematographic projection apparatus.
GB313439A
Improvements in or relating to safety devices for motion picture projectors
ES113024A1
Switch that serves to stop the translation of the film and to determine the concealment of the light rays in the cinematographic projection apparatus.
ES113025A1
A switch that serves to close an electrical circuit and to put into operation a stop device in cinematographic projection devices when the film breaks or deviates from its normal course.
GB333255A
Fire preventing means for motion picture projecting machines
US1803088A
Shutter control for motion-picture machines
DE511999C
Safety breaker for projection devices
US1820959A
Unitary safety device for motion picture projecting machines
US1847075A
Safety switch for motion picture projecting machines
US1725556A
Dowser-control mechanism for motion-picture-projecting machines
US1810348A
Dowser control mechanism for motion picture projecting machines
US1842658A
Operating mechanism for fire prevention apparatus
DE497287C
Auxiliary device with an electromagnet connected to the motor circuit for triggering the fire protection window of cinematographic devices
GB298597A
Improvements in or relating to automatic control apparatus for motion picture projecting machines
GB299760A
Improvements in or relating to safety appliances for motion picture projecting machines
