ISO 1720:1974 Rock drilling -- Extension drill-steel equipment for percussive long-hole drilling -- Rope-threaded equipments 1 1/2 to 2 in (38 to 51 mm)
Withdrawn in: 1991-01-01
Withdrawn by: TC 82
Replaced by: ISO 10207:1991 ,ISO 10208:1991
Last updated on 2001-04-25
Copyright © ISO, 2001