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Terebra API fabricae IADC126 4 3/4 pollices (120mm)
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Terebrae API trium conorum IADC126 4 5/8 unciarum (118mm) ad puteos perforandos
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Terebrae API ad usum aptatae IADC126 5 1/4 unciarum (133mm) ad saxum durum perforandum
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Tessellae triconicae ad puteos perforandos in promptu IADC126 6 pollices (152 mm)
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Terebra API Tricone IADC126 9.5 unciarum (241mm) venalis
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Terebra ad puteos perforandos IADC127 3 7/8″ unciae (98.4mm)
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Terebrae triconicae fabricator IADC127 4 9/16 unciarum (115.9mm)
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Foramen tricônum API IADC127 4 5/8 unciarum (118mm) venale
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Terebrae triconicae officinae IADC127 5 7/8 unciarum (149mm) ad puteos duros perforandos
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Terebrae obsignatae officinae IADC127 6 pollices (152mm)
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Terebrae in promptu IADC127 7 7/8 unciarum (200mm)
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Terebrae triconicae pretio vili IADC127 9 5/8” (244.5mm)