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发明名称
Process and apparatus for making tubular shells from sheet metal
摘要
申请公布号
US1999229(A)
申请公布日期
1935.04.30
申请号
US19310560062
申请日期
1931.08.29
申请人
BERNARD BENEDICT
发明人
BENEDICT BERNARD
分类号
B21D22/28
主分类号
B21D22/28
代理机构
代理人
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