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Original Shaffer Spherical BOP Patent

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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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patent drawings united states images extracted from united states patents uspto technical drawing patent application
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Date

13/04/1970
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Source

US Patent n° 3,667,721
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Link

http://commons.wikimedia.org/
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Copyright info

Public Domain

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patent drawings united states images extracted from united states patents uspto technical drawing patent application