Title:
Method and apparatus for closing and sealing openings in a well casing
United States Patent 3354955


Inventors:
Berry, William B.
Application Number:
US36244264A
Publication Date:
11/28/1967
Filing Date:
04/24/1964
Assignee:
Berry, William B.
Primary Class:
Other Classes:
138/98, 166/207
International Classes:
E21B43/10
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