US PATENT SUBCLASS 173 / 56
.~ Means concurrently moving shaft about an axis

Current as of: June, 1999
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173 /   HD   TOOL DRIVING OR IMPACTING

53  DF  HAMMER OR TOOL SHAFT RECIPROCATED BY GRIPPING MEANS WHICH RELEASE OR YIELD TO PERMIT ADVANCE {2}
56.~ Means concurrently moving shaft about an axis

DEFINITION

Classification: 173/56

(under subclass 53) Apparatus in which the grasp means, or means causing reciprocatory movement thereof, simultaneously causes the rod or rod like means to rotate or oscillate during each cycle of reciprocation of the grasp means.