US PATENT SUBCLASS 173 / 220
.~.~ With means to rotate reciprocating piston

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

213  DF  MEANS TO DRIVE TOOL ABOUT AN AXIS {7}
218  DF  .~ Fluid motor {4}
220.~.~ With means to rotate reciprocating piston

DEFINITION

Classification: 173/220

With means to rotate reciprocating piston:

(under subclass 218) Apparatus wherein a means is provided to revolve a linearly oscillating piston about its radial axis during its oscillation.