Inflatable safety shut-off for well bores or other openings

Details Inflatable safety shut-off for well bores or other openings Inflatable safety shut-off for well bores or other openings

E - Fixed Constructions

21

B

166/65

E21B 33/127 (2006.01) E21B 33/129 (2006.01)

Patent

CA 904748

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