Bacon & Thomas
Electric plaster cast saw control system
 An electric plastic cast saw control system for cutting off of plastic cast composed of an inner layer of absorbent cotton and an outer layer formed by hardened covering material including a thin conductive plate placed between the inner layer and the outer layer so that a relay device is triggered to cut off power supply to electric saw on the instant the saw gets contact with the thin conductive plate and consequently stop the electric saw instantaneously, and a reset device to resume power supply to the electric saw automatically or manually after cutting off of the power source. 
B A F
B27B A61F F16P
inventional inventional inventional
Chang-Min Chun-Mei
Yang Chou