US PATENT SUBCLASS 91 / 217
.~.~ Reciprocating piston and cylinder
Current as of:
June, 1999
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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.