US PATENT SUBCLASS 368 / 256
.~.~.~ With optical signal

Current as of: June, 1999
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368 /   HD   HOROLOGY: TIME MEASURING SYSTEMS OR DEVICES

243  DF  SIGNALLING MEANS {6}
244  DF  .~ Time condition responsive (i.e., alarm) {10}
250  DF  .~.~ Electrical {8}
256.~.~.~ With optical signal

DEFINITION

Classification: 368/256

With optical signal:

(under subclass 250) Subject matter wherein the alarm is a visible light signal.