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发明名称
BORRNINGSBOM.
摘要
申请公布号
FI871430(A)
申请公布日期
1987.10.03
申请号
FI19870001430
申请日期
1987.04.01
申请人
THE STEEL ENGINEERING COMPANY LTD
发明人
FOSTER, BRUCE ALLEN;HEDGES, RAYMOND
分类号
E21B15/04;(IPC1-7):E21C/
主分类号
E21B15/04
代理机构
代理人
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