Means to prevent inward leakage across seals in a well tool

E - Fixed Constructions – 21 – B

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255/1, 166/41

E21B 47/18 (2006.01) E21B 4/00 (2006.01) E21B 47/00 (2006.01) E21B 47/01 (2006.01)

Patent

CA 952818

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