US PATENT SUBCLASS 356 / 151
.~.~ With light pulsing or interrupting means

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

138  DF  ANGLE MEASURING OR ANGULAR AXIAL ALIGNMENT {11}
150  DF  .~ Sides of angle or axes being aligned transverse to optical axis (e.g., drift meter) {1}
151.~.~ With light pulsing or interrupting means

DEFINITION

Classification: 356/151

(under subclass 150) Subject matter including means whereby pulses are produced by alternately interrupting and transmitting a light beam.