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发明名称
Article of manufacture
摘要
申请公布号
US1848173(A)
申请公布日期
1932.03.08
申请号
US19280272040
申请日期
1928.04.23
申请人
BRUNO HEYMANN
发明人
HEYMANN BRUNO
分类号
B21D53/88
主分类号
B21D53/88
代理机构
代理人
主权项
地址
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