US PATENT SUBCLASS 340 / 856.1
.~ In horizontal or inclined passage arrangement

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

853.1  DF  WELLBORE TELEMETERING OR CONTROL (E.G., SUBSURFACE TOOL GUIDANCE, DATA TRANSFER, ETC.) {14}
856.1.~ In horizontal or inclined passage arrangement

DEFINITION

Classification: 340/856.1

In horizontal or inclined passage arrangement:

(under subclass 853.1) Subject matter wherein the opening in the earth is in other than a substantially vertical direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

853.4, for this subject matter having selective control of subsurface equipment.