US PATENT SUBCLASS 250 / 233
.~.~.~.~ Rotary

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
216  DF  .~ Optical or pre-photocell system {11}
229  DF  .~.~ Light valve (e.g., iris diaphragm) {3}
232  DF  .~.~.~ Light chopper type {1}
233.~.~.~.~ Rotary

DEFINITION

Classification: 250/233

(under subclass 232) Subject matter in which the means for intermittently interrupting the optical path is a rotary element.