US PATENT SUBCLASS 340 / 825.43
.~.~.~ Amplitude or polarity controlled

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}
825.43.~.~.~ Amplitude or polarity controlled

DEFINITION

Classification: 340/825.43

Amplitude or polarity controlled:

(under subclass 825.38) Subject matter where the indicator is selected by means of the amplitude or polarity of a current.