US PATENT SUBCLASS 367 / 80
.~.~.~.~ Frequency

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

14  DF  SEISMIC PROSPECTING {4}
37  DF  .~ Land-reflection type {6}
76  DF  .~.~ Telemetry {2}
78  DF  .~.~.~ Multiplex {2}
80.~.~.~.~ Frequency

DEFINITION

Classification: 367/80

Frequency:

(under subclass 78) Subject matter wherein signals are distinguished from one another by their frequency.