US PATENT SUBCLASS 73 / 120
.~.~ Piston ring

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

116  DF  MOTOR AND ENGINE TESTING {6}
119 R  DF  .~ Motor part {2}
120.~.~ Piston ring

DEFINITION

Classification: 73/120

(under subclass 119) Subject matter in which a piston ring is the thing tested.