US PATENT SUBCLASS 73 / 529
.~.~ Frictional (e.g., friction wheels)

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

488  DF  SPEED, VELOCITY, OR ACCELERATION {29}
527  DF  .~ With input means {2}
529.~.~ Frictional (e.g., friction wheels)

DEFINITION

Classification: 73/529

(under subclass 527) Apparatus including means for frictionally engaging a speed source.