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Tessellae triconicae IADC217 4.5 unciarum (114mm) ad puteos saxorum profundorum perforandos
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Terebra conica cylindrica sigillata API ad perforandum IADC217 5 7/8 unciarum (149.2mm)
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API terebrae praebitor IADC217 8 3/4 unciarum (222.2mm)
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cuspides terebrantes IADC217 17.5 pollices (444.5 mm)
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Terebrae tres coni fabricae IADC217 3 7/8 unciarum (98mm)
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Terebrae rotatoriae IADC217 6 pollices (152 mm)
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Terebrae API dentibus fresatis tribus conis IADC217 7.5 unciarum (190mm) in promptu
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Terebrae dentes chalybei oleosi API IADC217 8.5 unciarum (215mm) ad perforationem saxorum
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Terebrae puteorum profundorum IADC217 11 5/8 unciarum (295.3 mm) pro saxo duro
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Terebrae API Mill dentes IADC217 12 1/4 unciarum (311mm) ad puteos perforandos
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Terebrae pretio vili IADC217 14 3/4 unciarum (374mm) ad saxum durum perforandum