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Coni volubiles, cuspides perforatrices, IADC216, 5 5/8 unciarum (143 mm)
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Terebrae cylindricae obsignatae IADC216 5 7/8 pollices (149 mm)
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Terebrae triconicae in promptu IADC216 6 3/4 unciae (171mm)
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Terebra rotatoria anethi IADC216 7 7/8 unciarum (200mm)
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Terebrae rotatoriae praebitor IADC216 10 5/8 unciarum (269mm)
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Eme terebras perforatorias IADC216 17.5″ (444.5mm)
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Pretium terebrarum triconicarum API IADC216 4 5/8 unciarum (118mm)
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Terebrae triconicae putei profundi IADC216 6 unciae (152 mm)
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Terebra triconica adamantina IADC216 7.5 unciarum (190mm)
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Terebrae triconicae officinae IADC216 9 7/8 pollices (250.8 mm)
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Terebrae API fabricatae IADC216 4.5 unciae (114mm)
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API terebrae machinae perforatoriae IADC216 5 3/4 unciarum (146mm)