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发明名称
Method of making a thickened reinforced portion in a relatively thin metal plate
摘要
申请公布号
US2601029(A)
申请公布日期
1952.06.17
申请号
US19510214154
申请日期
1951.03.06
申请人
ILLINOIS WATCH CASE CO.
发明人
KING DAVID M.
分类号
B21D19/12
主分类号
B21D19/12
代理机构
代理人
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