US PATENT SUBCLASS 379 / 298
.~.~ Direct 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.~.~ Direct control {3}
299  DF  .~.~.~> Step-by-step system {4}
304  DF  .~.~.~> All relay type
305  DF  .~.~.~> Having motor-driven switch

DEFINITION

Classification: 379/298

Direct control:

(under subclass 258) Subject matter wherein successive switching devices for making the call connection are directly responsive to the calls address pulse signal transmitted from the calling station.