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发明名称
Improvements in or relating to oil well masts or derricks
摘要
申请公布号
GB598048(A)
申请公布日期
1948.02.10
申请号
GB19440006646
申请日期
1944.04.11
申请人
LEE C. MOORE AND COMPANY
发明人
分类号
E04H12/34;E21B15/00
主分类号
E04H12/34
代理机构
代理人
主权项
地址
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