US PATENT SUBCLASS 379 / 154
.~ At central office

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

143  DF  WITH CHECK OPERATED CONTROL (E.G., PAYSTATION) {5}
154.~ At central office

DEFINITION

Classification: 379/154

At central office:

(under subclass 143) Subject matter wherein the control function is performed at a switching station spaced remotely from the user terminal.