US PATENT SUBCLASS 379 / 180
.~.~ Full selective or tuned (e.g., harmonic)

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}
180.~.~ Full selective or tuned (e.g., harmonic)

DEFINITION

Classification: 379/180

Full selective or tuned (e.g., harmonic):

(under subclass 179) Subject matter which uniquely directs the ringing signal to a particular subscriber terminal.

(1) Note. The unique direction often uses frequency selection of the ringing signal.