US PATENT SUBCLASS 379 / 293
.~.~ Having line finder

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}
293.~.~ Having line finder {2}
294  DF  .~.~.~> Including electronic element (e.g., tube or semiconductor)
295  DF  .~.~.~> Plural

DEFINITION

Classification: 379/293

Having line finder:

(under subclass 258) Subject matter for locating and connecting a calling line to switching apparatus.

SEE OR SEARCH THIS CLASS, SUBCLASS:

377+, for an off-hook detector, per se.