US PATENT SUBCLASS 367 / 96
.~.~ External device

Current as of: June, 1999
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367 /   HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES

87  DF  ECHO SYSTEMS {6}
95  DF  .~ Returned signal used for control {2}
96.~.~ External device

DEFINITION

Classification: 367/96

External device:

(under subclass 95) Subject matter in which the device is not an integral part of the acoustic wave transmitting or receiving apparatus.