US PATENT SUBCLASS 91 / 217
.~.~ Reciprocating piston and cylinder


Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

196  DF  MOVING CYLINDER {4}
216 R  DF  .~ Cylinder and piston have relative reciprocation on fixed axis {3}
217.~.~ Reciprocating piston and cylinder


DEFINITION

Classification: 91/217

(under subclass 216) Apparatus in which the piston partakes of absolute back and forth movement in a fixed straight line.