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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
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FR615229D1926-04-281926-04-28Système de distribution pour marteaux et perforatrices à air comprimé
ExpiredFR615229A
(fr)