US PATENT SUBCLASS 166 / 207
.~ Expansible casing
Current as of:
June, 1999
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166 /
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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.