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standard by International Organization for Standardization, 10/01/1992
Specifies the material for and dimensions of equipment for drilling in solid or weakly fissured medium hard or hard formations to depths of 1200 m to 1500 m. Applies to equipment with outer bit diameters of 46 mm, 59 mm, 76 mm and 93 mm with corresponding core diameters from 24 mm to 59 mm.