US PATENT SUBCLASS 166 / 207
.~ Expansible casing

Current as of: June, 1999
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166 /   HD   WELLS

206  DF  EXPANSIBLE ANCHOR OR CASING {8}
207.~ Expansible casing

DEFINITION

Classification: 166/207

(under subclass 206) Devices in which the outwardly movable means comprises a section of casing which is expansible in the well.