US PATENT SUBCLASS 379 / 301
.~.~.~.~ Having potential control

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}
298  DF  .~.~ Direct control {3}
299  DF  .~.~.~ Step-by-step system {4}
301.~.~.~.~ Having potential control

DEFINITION

Classification: 379/301

Having potential control:

(under subclass 299) Subject matter which establishes or maintains electrical potential at some part of the switching system.