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发明名称
Method of forming alpha ring-shaped article
摘要
申请公布号
US1953795(A)
申请公布日期
1934.04.03
申请号
US19330666314
申请日期
1933.04.15
申请人
THE AMERICAN BRASS COMPANY
发明人
COOPER CHARLES F.
分类号
B21K1/76
主分类号
B21K1/76
代理机构
代理人
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