US PATENT SUBCLASS 379 / 319
.~ Single switchboard (e.g., cord circuit)

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
319.~ Single switchboard (e.g., cord circuit) {1}
320  DF  .~.~> Switchboard circuit {1}

DEFINITION

Classification: 379/319

Single switchboard (e.g, cord circuit):

(under subclass 242) Subject matter including structure or circuitry of a manual line switching apparatus actuated by a single operator.