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发明名称
Derrick construction
摘要
申请公布号
GB335546(A)
申请公布日期
1930.09.19
申请号
GB19290008887
申请日期
1929.03.19
申请人
WILLIAM ARTHUR TROUT
发明人
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
主权项
地址
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