US PATENT SUBCLASS 250 / 394
.~ 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}
394.~ Plural signalling means

DEFINITION

Classification: 250/394

(under subclass 336.1) Subject matter including two or more radiant energy responsive electric signalling means.