Relay valve and tracker bar or tubing assembly apparatus for...

Details Relay valve and tracker bar or tubing assembly apparatus for... Relay valve and tracker bar or tubing assembly apparatus for...

G - Physics

10

F

84/1.1

G10F 1/02 (2006.01)

Patent

CA 1085197

RELAY VALVE ASSEMBLY FOR PLAYER PIANOS ABSTRACT This apparatus pertains to mechanical and electromagnetic apparatus for controlling player piano operation. The conventional player piano paper tape which opens and closes pneumatic holes in a tracker bar is replaced by a valve board and plurality of electro- magnetic valves. Each electromagnetic valve operates to control air passage through one of the holes in the tracker bar. -1-

281877

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