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Status : Active
Standard Type : Main
Document No : ISO 1722:1974
Document Year : 1974
Pages : 6
Edition : 1
Section Volume : Mining - STANDBY (ISO/TC 82.)
Specifies the basic dimensions for equipment. Gives a list of components; tabulates together with figures: size of drill-steel in bar form; lengths of extension rods; coupling sleeves; bit diameters (four-wing bits); reverse-buttress threads; hollow hexagonal bars for extension rods.