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发明名称
Drilling boom
摘要
申请公布号
GB2189724(A)
申请公布日期
1987.11.04
申请号
GB19870007499
申请日期
1987.03.30
申请人
THE * STEEL ENGINEERING CO LIMITED
发明人
BRUCE ALLEN * FOSTER;RAYMOND * HEDGES
分类号
E21B15/04;(IPC1-7):E21C11/00
主分类号
E21B15/04
代理机构
代理人
主权项
地址
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