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发明名称
Apparatus for rough forcing rings
摘要
申请公布号
US1839531(A)
申请公布日期
1932.01.05
申请号
US19290362260
申请日期
1929.05.11
申请人
BRAUN VICTOR F
发明人
BRAUN VICTOR F.
分类号
B21K1/76
主分类号
B21K1/76
代理机构
代理人
主权项
地址
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