US PATENT SUBCLASS 173 / 207
.~.~ Having valve not directly associated with motive fluid for piston

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}
207.~.~ Having valve not directly associated with motive fluid for piston {1}
208  DF  .~.~.~> With accumulator

DEFINITION

Classification: 173/207

Having valve not directly associated with motive fluid for piston:

(under subclass 206) Apparatus having a means to control fluid flow not immediately involved with the force transmitting fluid for the hammer head.