Subsurface safety valve with improved balancing valve means

Details Subsurface safety valve with improved balancing valve means Subsurface safety valve with improved balancing valve means

E - Fixed Constructions

21

B

166/44

E21B 43/12 (2006.01) E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 978850

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