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US6450271B1
(en)
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Surface modifications for rotary drill bits
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CN102943642B
(zh)
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不提钻孔底冷冻绳索取心钻具及取心方法
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US3990751A
(en)
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Drill bit
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US4468056A
(en)
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Swivel
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US4365678A
(en)
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Tubular drill string member with contoured circumferential surface
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EP0190092B1
(de)
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Ölfeldrohr
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EP0531336B1
(de)
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Doppelkernrohr für abgelenkte bohrungen
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US5107942A
(en)
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Inner tube stabilizer for a corebarrel
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EP0248615A2
(de)
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Bohrvorrichtung
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RU92016516A
(ru)
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Двойная колонковая труба для наклонного бурения
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CA3010879A1
(en)
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Inner barrel crimping connection for a coring tool
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CN107829691A
(zh)
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一种内涂层岩心管
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SU941542A1
(ru)
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Уплотнительный элемент пакера
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BE886911A
(fr)
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Methode de recuperation et manutention de carottes de sondage, et tube prevu a cet effet.
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DD123550B
(de)
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