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发明名称
Drive for threaded bars
摘要
申请公布号
US2401757(A)
申请公布日期
1946.06.11
申请号
US19410408220
申请日期
1941.08.25
申请人
THE HARDSOCG MANUFACTURING COMPANY
发明人
HARDSOCG LESTER C.
分类号
E21B19/081
主分类号
E21B19/081
代理机构
代理人
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地址
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