US PATENT SUBCLASS 73 / 653
.~.~.~ With light beam indicator

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

570  DF  VIBRATION {10}
649  DF  .~ Sensing apparatus {5}
652  DF  .~.~ With inertia element {2}
653.~.~.~ With light beam indicator

DEFINITION

Classification: 73/653

With light beam indicator:

(under subclass 652) Subject matter wherein there is an indicator in the form of a light beam movable over a scale on the interferometer principle, usually over photofilm.