US PATENT SUBCLASS 379 / 21
.~ Using portable test set (e.g., handset type)

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379 /   HD   TELEPHONIC COMMUNICATIONS

1  DF  DIAGNOSTIC TESTING, MALFUNCTION INDICATION, OR ELECTRICAL CONDITION MEASUREMENT {12}
21.~ Using portable test set (e.g., handset type)

DEFINITION

Classification: 379/21

Using portable test set (e.g., handset type):

(under subclass 1) Subject matter in which a line test or measurement is performed with a device which is small and light enough to be easily carried by an individual.