Original Shaffer Spherical BOP Patent
13/04/1970 · US Patent n° 3,667,721
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Summary
Patent Drawing of the Original Spherical Blowout Preventer, by The Rucker Company (Shaffer),
U.S. Patent 3,667,721 (1972).
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Date
13/04/1970
Source
US Patent n° 3,667,721
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