US PATENT SUBCLASS 455 / 67.4
.~.~ Using a test signal

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

39  DF  TRANSMITTER AND RECEIVER AT SEPARATE STATIONS {14}
67.1  DF  .~ With measuring, testing, or monitoring of system or part {6}
67.4.~.~ Using a test signal

DEFINITION

Classification: 455/67.4

Using a test signal:

(under subclass 67.1) Subject matter wherein a signal of predetermined frequency (i.e., reference signal) is sent over the system for testing or measuring purposes.