US PATENT SUBCLASS 379 / 23
.~.~ Of line signalling

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

1  DF  DIAGNOSTIC TESTING, MALFUNCTION INDICATION, OR ELECTRICAL CONDITION MEASUREMENT {12}
22  DF  .~ Of trunk or long line {4}
23.~.~ Of line signalling

DEFINITION

Classification: 379/23

Of line signalling:

(under subclass 22) Subject matter which evaluates the transmission or operation of a control signal on a telephone line.