US PATENT SUBCLASS 92 / 213
.~.~ End face surface includes areas of diverse material

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}
213.~.~ End face surface includes areas of diverse material

DEFINITION

Classification: 92/213

(under subclass 208) Apparatus in which the end face surface is provided with a portion made of material which is different from the material which forms another portion of said end face.