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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 5279365 · Granted Jan 18, 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