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发明名称
PROCEDE DE FABRICATION DE STRUCTURES CYLINDRIQUES CREUSES AYANT PLUSIEURS CONTOURS INTERNES
摘要
申请公布号
BE861364(A1)
申请公布日期
1978.03.16
申请号
BE19770183065
申请日期
1977.11.30
申请人
GENERAL ELECTRIC CY
发明人
分类号
B21C37/20;B21H1/06;B21H1/12;(IPC1-7):B21B/
主分类号
B21C37/20
代理机构
代理人
主权项
地址
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