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发明名称
Pipe rotating device
摘要
申请公布号
US2089800(A)
申请公布日期
1937.08.10
申请号
US19340738788
申请日期
1934.08.07
申请人
JONES HULON B
发明人
JONES HULON B.
分类号
E21B19/16
主分类号
E21B19/16
代理机构
代理人
主权项
地址
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