US PATENT SUBCLASS 33 / 547
.~.~.~ Optical comparison

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

501  DF  GAUGE {61}
545  DF  .~ Comparison with a standard {1}
546  DF  .~.~ Profile {1}
547.~.~.~ Optical comparison

DEFINITION

Classification: 33/547

Optical comparison:

(under subclass 546) Subject matter which includes a projection screen having a curve to compare a point on the article contacted by the contact member by projecting the point unto the corresponding point on the curve on the screen.