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Terebra trium conorum IADC517 13 5/8″ (346mm)
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Terebra API IADC517 17 1/2″ (444.5mm)
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Terebra triconica rotatoria API IADC617 6" (152mm) ad puteos perforandos
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Terebra tricônica saxorum IADC617 8 1/2″ (215.9mm) ad puteos perforandos
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Fabricator API terebrae triconicae saxorum IADC617 9 7/8 pollicum" (250mm)
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Officina API terebrarum cylindricarum triconicarum IADC617 12 1/4 unciarum (311.1mm)
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Officina API terebrarum saxorum IADC617 17 1/2 unciarum (444.5mm) in promptu.
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Terebra API ex carburo tungsteno ad anethum perforandum, IADC627, 3 7/8″ (98mm), in promptu.
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Terebra rotatoria IADC627 8 1/2″ (215mm/216mm)
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Terebra cylindrica triconica IADC637 4 3/4″ (120mm) ad perforationem saxorum duriorum
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Triconum globosum densum biit IADC637 5.5″ (140mm)
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Officina API tricônorum TCI biit IADC637 6" (152.4mm) in promptu.