US PATENT SUBCLASS 375 / 275
.~.~.~ More than two frequencies

Current as of: June, 1999
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375 /   HD   PULSE OR DIGITAL COMMUNICATIONS

259  DF  SYSTEMS USING ALTERNATING OR PULSATING CURRENT {4}
271  DF  .~ Angle modulation {2}
272  DF  .~.~ Frequency shift keying {6}
275.~.~.~ More than two frequencies

DEFINITION

Classification: 375/275

More than two frequencies:

(under subclass 272) Subject matter in which the carrier wave is shifted between more than two frequencies.