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BW NW HW PW casing pipes for wireline core drilling

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BW NW HW PW casing pipes for wireline core drilling

ꄴPrevious： 73 mm drill pipes of a prefabricated structure with inward-facing ends, left-handed, wall thickness 9 mm, strength group - "E". L = 11.5 - 11.9 m (with lock ZN-95)      
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