Title:
UNDERWATER WELLHEAD INSTALLATION
United States Patent 3461957

Inventors:
WEST FRANCIS G
Publication Date:
08/19/1969
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Assignee:
SHELL OIL CO
Primary Class:
166/351
Other Classes:
166/368
International Classes:
E21B33/037; E21B33/03; E21B33/035; E21B43/01
US Patent References:
3202218Submergible apparatus for underwater operations
3247672Underwater well head encasement structure




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