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发明名称
Method for the production of hollow bodies closed at one side by punching of four-edged blocks
摘要
申请公布号
US2215943(A)
申请公布日期
1940.09.24
申请号
US19370165224
申请日期
1937.09.22
申请人
RUDOLF TRAUT
发明人
TRAUT RUDOLF
分类号
B21J9/04
主分类号
B21J9/04
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代理人
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