US PATENT SUBCLASS 173 / 91
.~ Selective axial direction of impact

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
91.~ Selective axial direction of impact

DEFINITION

Classification: 173/91

(under subclass 90) Apparatus in which the hammer is selectively operable to deliver impacts in axially opposed directions.