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Overburden Concentric Casing Drilling System with 2 or 3 Wings2020-03-10 14:05:38 |
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Rotary Wings Eccentric Concentric Overburden Casing Drilling System2020-03-10 14:05:38 |
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Concentric Super Jaws Casing Drilling System With 4"-12" Hammer Type2020-03-10 14:05:40 |