US PATENT SUBCLASS 173 / 201
.~.~ Pulsation caused by mechanical movement

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

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
200  DF  .~ Hammer head driven by pulsating fluid pressure {1}
201.~.~ Pulsation caused by mechanical movement

DEFINITION

Classification: 173/201

Pulsation caused by mechanical movement:

(under subclass 200) Apparatus wherein application and subsequent release of the fluid force is caused by movable, mechanically operated elements.