Stanford Conn, a cloud of fog forms over this cleaning trough as sound waves, too high-pitched to be heard by the human ear, are directed through a solvent to clean shaver heads at Schick Incorporated, manufacturers of electric shavers here. As shear heads pass from left to right through an ultrasonic cleaning machine, alternate electric charges cause a quartz crystal under trough to emit sound waves which are directed through the cleaning solvent and into all small openings and corners of the shaver heads. The machine, developed by engineers at the General Electric Engineering Company, Schenectady NY, is said to do a more thorough cleaning of shaver heads than any method yet devised. Although a cleaning solvent is used in the process, the combination of both solvent and the sound waves is said to clean small openings and corners where cleaning solvent alone would be ineffective. The cloud of spray and fumes, caused by action if the sound waves, is dispelled through rear of the machine

General Electric Company1951-04-12