US PATENT SUBCLASS 250 / 349
.~.~ Plural signalling means

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

336.1  DF  INVISIBLE RADIANT ENERGY RESPONSIVE ELECTRIC SIGNALLING {16}
338.1  DF  .~ Infrared responsive {12}
349.~.~ Plural signalling means {1}
350  DF  .~.~.~> With periodic beam varying means

DEFINITION

Classification: 250/349

(under subclass 338.1) Subject matter having two or more infrared responsive electric signalling means.