US PATENT SUBCLASS 173 / 103
.~.~ Concentric

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
101  DF  .~ Plural relatively moved hammer heads {2}
103.~.~ Concentric

DEFINITION

Classification: 173/103

(under subclass 101) Apparatus in which the relatively movable impacting heads are arranged in such a manner that a common line passes through the geometric centers of both heads.