US PATENT SUBCLASS 92 / 239
.~.~ With rib or strut means on piston part

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

172  DF  PISTON {19}
208  DF  .~ Open-ended hollow skirt type (e.g., trunk type) {15}
239.~.~ With rib or strut means on piston part

DEFINITION

Classification: 92/239

(under subclass 208) Apparatus in which the end face or the skirt portion is provided with (1) a projecting formation in the form of a rib or corrugation or (2) a rigid member secured to an end face and a skirt portion.