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发明名称
DRILLING MAST AND SUBSTRUCTURE THEREFOR
摘要
申请公布号
GB2046812(A)
申请公布日期
1980.11.19
申请号
GB19790004898
申请日期
1979.02.12
申请人
PATTERSON B C
发明人
分类号
E04H12/34;E21B15/00;(IPC1-7):E21B15/00
主分类号
E04H12/34
代理机构
代理人
主权项
地址
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