US PATENT SUBCLASS 379 / 331
.~ Having protective circuit

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
331.~ Having protective circuit

DEFINITION

Classification: 379/331

Having protective circuit:

(under subclass 242) Subject matter which prevents damage to the circuits of the central switching system from improper conditions.