US PATENT SUBCLASS 379 / 321
.~.~.~ Connection to operator's terminal

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
319  DF  .~ Single switchboard (e.g., cord circuit) {1}
320  DF  .~.~ Switchboard circuit {1}
321.~.~.~ Connection to operator's terminal

DEFINITION

Classification: 379/321

Connection to operator's terminal:

(under subclass 320) Subject matter including a detail of a connection between the switchboard and the operator's telephone set.