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)

Заменен на ISO 10207(1991.02)*ISO 10208(1991.02)
 

6 страниц

Завершение срока действия 01.02.1991
Опубликован 01.07.1974

Rock drilling; Extension drill-steel equipment for percussive long-hole drilling; Rope-threaded equipments 1 1/2 to 2 in (38 to 51 mm)