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经营范围
发明名称
Kelly bushing
摘要
申请公布号
US2558806(A)
申请公布日期
1951.07.03
申请号
US19470735152
申请日期
1947.03.17
申请人
ABEGG & REINHOLD CO.
发明人
ABEGG WALTER A.
分类号
E21B3/04
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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