US PATENT SUBCLASS 379 / 9
.~ Of centralized switching system

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


379 /   HD   TELEPHONIC COMMUNICATIONS

1  DF  DIAGNOSTIC TESTING, MALFUNCTION INDICATION, OR ELECTRICAL CONDITION MEASUREMENT {12}
9.~ Of centralized switching system {6}
10  DF  .~.~> By automatic testing sequence (e.g., programmable, scanning) {1}
12  DF  .~.~> With dedicated testing line or trunk
13  DF  .~.~> Of call timing or charging equiment
14  DF  .~.~> Of plural exchange network
15  DF  .~.~> Of automatic switching equipment {4}
20  DF  .~.~> Of switchboard element condition (e.g., lamp)

DEFINITION

Classification: 379/9

Of centralized switching system:

(under subclass 1) Subject matter for evaluating the operation of a system or component which selectively connects two of a plurality of telephone lines for communication therebetween.

SEE OR SEARCH THIS CLASS, SUBCLASS:

242+, for a centralized telephone switching system.