US PATENT SUBCLASS 340 / 825.39
.~.~.~ Selection by means of frequency

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

825  DF  SELECTIVE {23}
825.36  DF  .~ Having indication or alarm (e.g., location indication) {4}
825.38  DF  .~.~ Party line {4}
825.39.~.~.~ Selection by means of frequency

DEFINITION

Classification: 340/825.39

Selection by means of frequency:

(under subclass 825.38) Subject matter where the indicator is actuated by means of a cyclic current of a frequency peculiar to the selected indicator.