US PATENT SUBCLASS 173 / 92
.~ With means to grip and release tool in timed relation to impact

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
92.~ With means to grip and release tool in timed relation to impact

DEFINITION

Classification: 173/92

(under subclass 90) Apparatus including a means to mechanically clutch and release the tool or tool shaft during each cycle of operation of the hammer.