US PATENT SUBCLASS 379 / 320
.~.~ Switchboard circuit

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.~.~ Switchboard circuit {1}
321  DF  .~.~.~> Connection to operator's terminal

DEFINITION

Classification: 379/320

Switchboard circuit:

(under subclass 319) Subject matter including a detail of the switchboard circuitry.