US PATENT SUBCLASS 356 / 22
.~.~.~ With displaced images

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

3  DF  RANGE OR REMOTE DISTANCE FINDING {9}
20  DF  .~ External basis type {1}
21  DF  .~.~ Object size or distance known {1}
22.~.~.~ With displaced images

DEFINITION

Classification: 356/22

(under subclass 21) Subject matter where the instrument

provides two displaced images of the same object for viewing by the observer.