Device of making Player-pianos and Piano-players Self-cleaning.

摘要

109,698. Rorke, J. D. M. Nov. 25, 1916. Drawings to Specification. Actions, cleaning. A nozzle connected by a flexible tube to the main exhaust is applied to the tracker ducts to extrect dust from the passages and valves. The flexible tube may be connected to a valve in the motor exhaust pipe by which suction can be diverted from the motor to the nozzle. Reference has been directed by the Comptroller to Specification 166,151.