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发明名称
Polygonal bolt head forming punch
摘要
申请公布号
US2939160(A)
申请公布日期
1960.06.07
申请号
US19570673083
申请日期
1957.07.19
申请人
NATIONAL LOCK CO.
发明人
MITCHELL HARVEY H.
分类号
B21K1/46
主分类号
B21K1/46
代理机构
代理人
主权项
地址
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