US PATENT SUBCLASS 367 / 49
.~.~.~ 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}
38  DF  .~.~ Signal analysis and/or correction {15}
49.~.~.~ Frequency

DEFINITION

Classification: 367/49

Frequency:

(under subclass 38) Subject matter wherein the distinction is made among the frequencies of the various signals or constituents thereof.