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发明名称
Girt construction for compression-type derricks
摘要
申请公布号
US1760154(A)
申请公布日期
1930.05.27
申请号
US19260129876
申请日期
1926.08.18
申请人
PICKERING LUMBER COMPANY
发明人
LYNCH CHARLES W.
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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