US PATENT SUBCLASS 379 / 357
.~.~.~ Insertable control element or circuitry (e.g., card)

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

350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
352  DF  .~ Substation originated {8}
355  DF  .~.~ Repertory or abbreviated call signal generation {4}
357.~.~.~ Insertable control element or circuitry (e.g., card)

DEFINITION

Classification: 379/357

Insertable control element or circuitry (e.g., card):

(under subclass 355) Subject matter comprising a circuit element or other object which controls the generation of the call signal, and is readily removable from the signal generator.