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Terebra rupium triconica API TCI IADC637 6 3/4″ (171.4mm)
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Pretium terebrae API Tricone IADC637 8 1/2” (215.9mm)
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Terebra rotatoria cum globulo IADC617 12 1/4 unciarum (311 mm)
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Terebrae triconicae API fabricatae IADC637 12 1/4" (311.1mm)
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Terebra metallica obsignata IADC637 14 3/4" (374.6mm) ad puteum profundum
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Terebra trium conorum IADC637 17 1/2” (444.5mm)
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Frusta triconica IADC637, 6.5 unciae (165mm) ad saxum durum destinata.
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Terebrae rotatoriae IADC637 9 7/8" (250.8mm)
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Officina API terebrarum conicarum cylindricarum IADC637 3 7/8″ (98mm) in promptu.
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Terebrae pro globulis IADC637 7 7/8" (200mm)
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Terebrae triconicae API IADC637 9 5/8" (244.5mm) in promptu
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Terebra triconica TCI IADC617 6 1/2″ (165mm) ad machinam perforatricem