US PATENT SUBCLASS 250 / 559.15
.~.~.~ With plural detectors

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
559.01  DF  .~ With circuit for evaluating a web, strand, strip, or sheet {13}
559.12  DF  .~.~ Beam interruption or shadow {3}
559.15.~.~.~ With plural detectors

DEFINITION

Classification: 250/559.15

With plural detectors:

(under subclass 559.12) Subject matter having more than one independent photocell to detect light from the source.