US PATENT SUBCLASS 356 / 125
.~ Focal length measuring

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

124  DF  LENS OR REFLECTIVE IMAGE FORMER TESTING {3}
125.~ Focal length measuring {1}
126  DF  .~.~> Deflecting or interrupting optical path

DEFINITION

Classification: 356/125

(under subclass 124) Subject matter for measuring the focal length of a lens or reflector.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements,

383, and 425+ for focusing means for compound lens systems; and subclasses 676+ and 823+ for lens focusing means.