US PATENT SUBCLASS 250 / 565
.~.~.~ With comparison

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
206  DF  .~ Photocell controlled circuit {9}
564  DF  .~.~ With circuit for evaluating a fluent material {1}
565.~.~.~ With comparison

DEFINITION

Classification: 250/565

(under subclass 564) Subject matter including a circuit or circuits for evaluating the relative output of two photocells, a photocell and a stored value or the photocell output sequentially as from a sample and standard.