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发明名称
Verfahren zur Verbesserung der Schweissnaht bei stumpfgeschweissten Rohren
摘要
申请公布号
DE571532(C)
申请公布日期
1933.03.01
申请号
DED571532D
申请日期
1930.03.11
申请人
HEINRICH ESSER
发明人
分类号
B21D51/28
主分类号
B21D51/28
代理机构
代理人
主权项
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