US PATENT SUBCLASS 379 / 20
.~.~ Of switchboard element condition (e.g., lamp)

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}
20.~.~ Of switchboard element condition (e.g., lamp)

DEFINITION

Classification: 379/20

Of switchboard element condition (e.g., lamp):

(under subclass 9) Subject matter for evaluating an element of an arrangement for manual line interconnection.

(1) Note. Such elements may include lamps or cords.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing,

403+, for testing of a lamp, in general.