US PATENT SUBCLASS 414 / 22.53
.~.~ For nonvertical drilling

Current as of: June, 1999
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414 /   HD   MATERIAL OR ARTICLE HANDLING

22.51  DF  WELL PIPE OR ROD RACKING MECHANISM {3}
22.52  DF  .~ With slope change {4}
22.53.~.~ For nonvertical drilling

DEFINITION

Classification: 414/22.53

For nonvertical drilling:

(under subclass 22.52) Apparatus wherein inclination of the cylindrical member is changed to establish drilling direction other than toward the center of the earth.