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经营范围
发明名称
Unibolt coupling
摘要
申请公布号
US2565744(A)
申请公布日期
1951.08.28
申请号
US19490089328
申请日期
1949.04.23
申请人
M. O. JOHNSTON
发明人
SINCLAIR GEORGE W.
分类号
E21B19/00
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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