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B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
B25D9/14—Control devices for the reciprocating piston
B25D9/16—Valve arrangements therefor
B25D9/18—Valve arrangements therefor involving a piston-type slide valve
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FR326981D1902-12-031902-12-03Perfectionnements aux marteaux pneumatiques
ExpiredFR326981A
(fr)