A borehole charge at mass blasts in pits includes inner stem with rubber plug in the hole mouth. The rubber plug is arranged as wedged by means of tubular anchor.
申请公布号
UA59525(U)
申请公布日期
2011.05.25
申请号
UA20100009667U
申请日期
2010.08.02
申请人
NATIONAL MINING UNIVERSITY, STATE HIGHER INSTITUTION
