US PATENT SUBCLASS 379 / 218
.~ Performed by operator (e.g., butt-in, busy verification)

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

201  DF  SPECIAL SERVICES {9}
218.~ Performed by operator (e.g., butt-in, busy verification)

DEFINITION

Classification: 379/218

Performed by operator (e.g., butt-in, busy verification):

(under subclass 201) Subject matter wherein the special service is performed by an attendant at a central or branch switching station.

SEE OR SEARCH THIS CLASS, SUBCLASS:

48, for telephone alarm butt-in equipment.