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经营范围
发明名称
Portable oil well derrick
摘要
申请公布号
US2611455(A)
申请公布日期
1952.09.23
申请号
US19490114959
申请日期
1949.09.10
申请人
RIDLEY WOODS
发明人
WOODS RIDLEY
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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