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发明名称
Spring hook
摘要
申请公布号
US2058186(A)
申请公布日期
1936.10.20
申请号
US19340724503
申请日期
1934.05.08
申请人
THE NATIONAL SUPERIOR COMPANY
发明人
SPALDING JOHN D.
分类号
E21B19/04
主分类号
E21B19/04
代理机构
代理人
主权项
地址
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