US PATENT SUBCLASS 340 / 825.38
.~.~ Party line

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.~.~ Party line {4}
825.39  DF  .~.~.~> Selection by means of frequency
825.4  DF  .~.~.~> Selector or indicator, per se
825.41  DF  .~.~.~> Step-by-step impulse {1}
825.43  DF  .~.~.~> Amplitude or polarity controlled

DEFINITION

Classification: 340/825.38

Party line:

(under subclass 825.36) Subject matter intended for a telephone or telegraph system, where an indicator at a particular telephone or telegraph instrument is selectively actuated.

(1) Note. Subject matter including handling of an information signal is classified in Class 178, as appropriate.