US PATENT SUBCLASS 356 / 20
.~ External basis type

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

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

DEFINITION

Classification: 356/20

(under subclass 3) Subject matter wherein the complete measurement requires the knowledge of some distance or interval external to the measuring instrument.

SEE OR SEARCH CLASS

33, Geometrical Instruments, appropriate subclasses, particularly

262, 276, and 284, for similar subject matter with no significant optical feature.