US PATENT SUBCLASS 379 / 294
.~.~.~ Including electronic element (e.g., tube or semiconductor)

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

DEFINITION

Classification: 379/294

Including electronic element (e.g., tube or semiconductor):

(under subclass 293) Subject matter including an electron discharge device or semiconductor component.

SEE OR SEARCH THIS CLASS, SUBCLASS:

287, and 292, for electronic elements in other telephone switching systems.