US PATENT SUBCLASS 379 / 262
.~.~.~ Call extension by operator

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}
260  DF  .~.~ With operator position or completion of call (e.g., dial "O", semiautomatic) {4}
262.~.~.~ Call extension by operator {2}
263  DF  .~.~.~.~> With call indicator or announcer
264  DF  .~.~.~.~> A to B operator

DEFINITION

Classification: 379/262

Call extension by operator:

(under subclass 260) Subject matter where the operator dials the called station address.