US PATENT SUBCLASS 324 / 328
.~.~.~ Of the beat frequency type

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

323  DF  OF GEOPHYSICAL SURFACE OR SUBSURFACE IN SITU {7}
326  DF  .~ For small object detection or location {2}
327  DF  .~.~ Using oscillator coupled search head {1}
328.~.~.~ Of the beat frequency type

DEFINITION

Classification: 324/328

Of the beat frequency type:

(under subclass 327) Subject matter having means for mixing

the search head signal with another signal to produce a difference frequency output.

SEE OR SEARCH CLASS

331, Oscillators,

37+, for beat frequency oscillator circuits in general.