US PATENT SUBCLASS 379 / 181
.~.~ Semi-selective (e.g., line side, polarized)

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

177  DF  POLYSTATION LINE SYSTEM (I.E., PARTY LINE) {6}
179  DF  .~ Call alerting (e.g., ringing) {2}
181.~.~ Semi-selective (e.g., line side, polarized)

DEFINITION

Classification: 379/181

Semi-selective (e.g., line side, polarized):

(under subclass 179) Subject matter wherein the ringing signal is directed to a subset of the terminals connected to the line.

(1) Note. The signal direction often uses control of the polarity of, or the side to which, the signal is directed.