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发明名称
Retaining device
摘要
申请公布号
US2590196(A)
申请公布日期
1952.03.25
申请号
US19470743741
申请日期
1947.04.25
申请人
E. I. DU PONT DE NEMOURS & COMPANY
发明人
MESSINGER LESTER H.
分类号
E21F1/04
主分类号
E21F1/04
代理机构
代理人
主权项
地址
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