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发明名称
Method of making a ring
摘要
申请公布号
US1863618(A)
申请公布日期
1932.06.21
申请号
US19300475356
申请日期
1930.08.14
申请人
BROGAN BYARD F
发明人
BROGAN BYARD F.
分类号
B21D53/44
主分类号
B21D53/44
代理机构
代理人
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