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发明名称
Method of making welded connections for sheet metal articles
摘要
申请公布号
US2237535(A)
申请公布日期
1941.04.08
申请号
US19380244813
申请日期
1938.12.09
申请人
GORDON M. EVANS
发明人
WAHL FREDERICK G.
分类号
B21D51/18
主分类号
B21D51/18
代理机构
代理人
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