US PATENT SUBCLASS 173 / 102
.~.~ One impacts another

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}
102.~.~ One impacts another

DEFINITION

Classification: 173/102

(under subclass 101) Apparatus in which one impacting head imparts impact to a tool by striking another impacting head.