US PATENT SUBCLASS 92 / 160
.~.~ Port or passage extending through side wall portion

Current as of: June, 1999
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92 /   HD   EXPANSIBLE CHAMBER DEVICES

153  DF  WITH LUBRICATING MEANS {5}
158  DF  .~ Piston has lubricant retaining or conducting means {2}
160.~.~ Port or passage extending through side wall portion

DEFINITION

Classification: 92/160

(under subclass 158) Apparatus in which said means comprises a passage or port which extends completely through a portion

of the side wall of the piston so that there is an unobstructed opening from the piston outer periphery to the interior of the piston.