US PATENT SUBCLASS 250 / 347
.~.~ With movable beam deflector or focussing 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}
347.~.~ With movable beam deflector or focussing means {1}
348  DF  .~.~.~> Controlled by signalling means

DEFINITION

Classification: 250/347

(under subclass 338.1) Subject matter having means to change

the path of the infrared radiation from the source to the signalling means; or to cause the radiation to converge, the orientation or position of the means being changeable with respect to some part of the path or signalling means.