US PATENT SUBCLASS 379 / 299
.~.~.~ Step-by-step system

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.~.~.~ Step-by-step system {4}
300  DF  .~.~.~.~> Having plural wiper sets
301  DF  .~.~.~.~> Having potential control
302  DF  .~.~.~.~> Having rotary switch
303  DF  .~.~.~.~> Coordinate system (e.g., X-Y)

DEFINITION

Classification: 379/299

Step-by-step system:

(under subclass 298) Subject matter having a plurality of switching stages working sequentially and independently of the state of subsequent stages.