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发明名称
Method of preparing pen-points
摘要
申请公布号
US2005752(A)
申请公布日期
1935.06.25
申请号
US19340706565
申请日期
1934.01.13
申请人
PFANSTIEHL CHEMICAL CO.
发明人
PFANSTIEHL CARL
分类号
B21D53/76
主分类号
B21D53/76
代理机构
代理人
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地址
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