US PATENT SUBCLASS 73 / 525
.~.~ Brake (e.g., vanes in air)

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

488  DF  SPEED, VELOCITY, OR ACCELERATION {29}
521  DF  .~ Fluid {4}
525.~.~ Brake (e.g., vanes in air)

DEFINITION

Classification: 73/525

(under subclass 521) Apparatus wherein response is to the force required to drive a speeding element through fluid.