US PATENT SUBCLASS 379 / 13
.~.~ Of call timing or charging equiment

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

1  DF  DIAGNOSTIC TESTING, MALFUNCTION INDICATION, OR ELECTRICAL CONDITION MEASUREMENT {12}
9  DF  .~ Of centralized switching system {6}
13.~.~ Of call timing or charging equiment

DEFINITION

Classification: 379/13

Of call timing or charging equipment:

(under subclass 9) Subject matter for evaluating equipment which measures call duration or cost.

SEE OR SEARCH THIS CLASS, SUBCLASS:

111+, for a call timing and charging arrangement.