US PATENT SUBCLASS 379 / 228
.~.~.~ Having signalling to operator

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

219  DF  PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
226  DF  .~ Having a manual exchange {1}
227  DF  .~.~ With an automatic exchange {1}
228.~.~.~ Having signalling to operator

DEFINITION

Classification: 379/228

Having signalling to operator:

(under subclass 227) Subject matter which causes an indication at an operator position at a remote switching office.