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Home › Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms

Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms

US Patent 5277249 · Granted Jan 11, 1994

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Rotary blowout preventer adaptable for use with both kelly and overhead drive me1993
Rotary blowout preventer adaptable for use with both kelly and overhead drive me1993
Rotary blowout preventer adaptable for use with both kelly and overhead drive me1993