US PATENT SUBCLASS 173 / 137
.~.~.~ Reduced area 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}
137.~.~.~ Reduced area striking face

DEFINITION

Classification: 173/137

(under subclass 135) Apparatus in which the total area of the surface of the element to which fluid motive material is applied is greater than the area of the surface that strikes the blow.