US PATENT SUBCLASS 379 / 412
.~ Protective circuit

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

399  DF  SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE {5}
412.~ Protective circuit

DEFINITION

Classification: 379/412

Protective circuit:

(under subclass 399) Subject matter having a circuit which prevents damage to the telephone line.

SEE OR SEARCH CLASS

361, Electricity: Electrical Systems and Device,

119, for high voltage surge protection of a communication line.