US PATENT SUBCLASS 175 / 98
.~.~ Expansible anchor

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

92  DF  WITH BELOW-GROUND TOOL DRIVE PRIME MOVER {11}
97  DF  .~ With means to anchor prime movers support to bore wall {1}
98.~.~ Expansible anchor {1}
99  DF  .~.~.~> Fluid-operated

DEFINITION

Classification: 175/98

(under subclass 97) Apparatus in which said means may be selectively expanded or retracted to or from engagement with the bore wall.

SEE OR SEARCH CLASS

166, Wells,

206+, for an expansible anchor or casing for wells.