US PATENT SUBCLASS 379 / 385
.~.~ Relayless

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

350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
377  DF  .~ Using line or loop condition detection (e.g., line circuit) {7}
385.~.~ Relayless

DEFINITION

Classification: 379/385

Relayless:

(under subclass 377) Subject matter wherein line or loop condition signalling is performed by circuitry other than electromagnetically operated contacts.