US PATENT SUBCLASS 324 / 345
.~ By magnetic means

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}
345.~ By magnetic means {1}
346  DF  .~.~> Within a borehole

DEFINITION

Classification: 324/345

By magnetic means:

(under subclass 323) Subject matter having magnetic means to determine the electrical characteristics of the subsurface.

(1) Note. For example, the magnetic field, due to artificial or natural earth current, may be determined.

SEE OR SEARCH THIS CLASS, SUBCLASS:

331, for determining the magnetic field by aerial survey.