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Patent Us5335738 Tools For Percussive And Rotary Crushing

A quothole bottomquot hammer drill comprising a tubular body 1 supplied with compressed air a drill bit 3 and a percussion piston 38 caused to move in an inner cylinder 7 by a mechanism distributing compressed air alternately below and above the pistonThe hammer drill includes a device 29 for injecting gas oil into the chamber 71 above the piston 38 and a mechanism 34 35 for

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