US PATENT SUBCLASS 92 / 155
.~ Portion of expansible chamber device includes solid lubricating material

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

153  DF  WITH LUBRICATING MEANS {5}
155.~ Portion of expansible chamber device includes solid lubricating material

DEFINITION

Classification: 92/155

(under subclass 153) Apparatus in which a part of the expansible chamber device which is in slidable engagement with another part of such device is formed of material which inherently performs a lubricating function.