Mine prop 10 comprising a plurality of axially spaced circumferential grooves 24, 26 cut into a timber post 12, and a sleeve 22 around the post 12. <IMAGE>
申请公布号
FR2546965(A1)
申请公布日期
1984.12.07
申请号
FR19830005947
申请日期
1983.04.12
申请人
BALTIC INVESTMENTS SA
发明人
BRIAN GILBERT HOLDER ET WILLIAM KENNETH FREDERICK MCCALLUM;MCCALLUM WILLIAM KENNETH FREDE
