US PATENT SUBCLASS 340 / 931
.~ Traffic control or local controller failure indicator

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

907  DF  TRAFFIC CONTROL INDICATOR {8}
931.~ Traffic control or local controller failure indicator

DEFINITION

Classification: 340/931

Traffic control or local controller failure indicator:

(under subclass 907) Subject matter having means to detect failure of one of the traffic control indicators or the presence of an improper output from the local controller.

SEE OR SEARCH THIS CLASS, SUBCLASS:

641+, for generic alarms responsive to the condition of an indicator light element.