US PATENT SUBCLASS 379 / 140
.~.~ At subscriber

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

111  DF  WITH USAGE MEASUREMENT (E.G., CALL OR TRAFFIC REGISTER) {3}
133  DF  .~ Call traffic recording or monitoring {2}
140.~.~ At subscriber {1}
141  DF  .~.~.~> Mechanical register

DEFINITION

Classification: 379/140

At subscriber:

(under subclass 133) Subject matter wherein the determination is made at the location of a telephone terminal set.