US PATENT SUBCLASS 73 / 520.01
.~.~.~ With a flux adjusting means

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

488  DF  SPEED, VELOCITY, OR ACCELERATION {29}
514.39  DF  .~ Magnetic speed measuring or mechanical speed measuring with ancillary magnetic means or with ancillary electrical means {1}
519.01  DF  .~.~ Eddy current drag means (e.g., drag cup) {1}
520.01.~.~.~ With a flux adjusting means

DEFINITION

Classification: 73/520.01

With a flux adjusting means:

(under subclass 519.01) Subject matter combined with means for varying the magnetic coupling between the drag element and the permanent magnet.