US PATENT SUBCLASS 379 / 297
.~.~ Having specified busy-idle test

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
258  DF  .~ Switching controlled in response to called station addressing signal {9}
297.~.~ Having specified busy-idle test

DEFINITION

Classification: 379/297

Having specified busy-idle test:

(under subclass 258) Subject matter including equipment to determine whether or not a component desired for use is already in use.

SEE OR SEARCH THIS CLASS, SUBCLASS:

274, 277, 337, and 381, for busy-idle testing in specific equipment.