US PATENT SUBCLASS 173 / 136
.~.~.~ Supplied through passage in striking face

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
206  DF  .~ Hammer head constitutes piston of drive motor {4}
135  DF  .~.~ Motive fluid applied to striking face {2}
136.~.~.~ Supplied through passage in striking face

DEFINITION

Classification: 173/136

(under subclass 135) Apparatus in which the surface of the element which strikes the blow is provided with a port through which fluid motive material is supplied.