US PATENT SUBCLASS 379 / 168
.~ Lockout

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

167  DF  PRIVATE (E.G., HOUSE OR INTERCOM) OR SINGLE LINE SYSTEM {6}
168.~ Lockout {1}
169  DF  .~.~> Central power source

DEFINITION

Classification: 379/168

Lockout:

(under subclass 167) Subject matter which blocks access to the system by stations other than those involved in a specific communication.