Oil well derrick substructure with carriage for blowout...

Details Oil well derrick substructure with carriage for blowout... Oil well derrick substructure with carriage for blowout...

E - Fixed Constructions

21

B

166/50

E21B 33/064 (2006.01) E21B 15/00 (2006.01)

Patent

CA 929853

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