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发明名称
Structural shape and method of making same
摘要
申请公布号
US1802397(A)
申请公布日期
1931.04.28
申请号
US19270237007
申请日期
1927.12.01
申请人
TRACHSEL LOUIS S
发明人
TRACHSEL LOUIS S.
分类号
B21D11/15
主分类号
B21D11/15
代理机构
代理人
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