US PATENT SUBCLASS 379 / 199
.~ At substation

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

188  DF  CALL OR TERMINAL ACCESS ALARM OR CONTROL {5}
199.~ At substation {1}
200  DF  .~.~> Restrictive dialing circuit

DEFINITION

Classification: 379/199

At substation:

(under subclass 188) Subject matter wherein the call or terminal restriction or alerting function is performed at a subscriber terminal.