US PATENT SUBCLASS 379 / 138
.~.~.~.~ All trunks busy metering

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}
134  DF  .~.~ At central station {4}
137  DF  .~.~.~ Trunk usage (e.g., peg count) {1}
138.~.~.~.~ All trunks busy metering

DEFINITION

Classification: 379/138

All trunks busy metering:

(under subclass 137) Subject matter which determines the duration during which all trunks monitored are in a busy condition.