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发明名称
Dispositif pour former sur un tronçon de tuyau une ailette hélicoïdale faisant corps avec lui.
摘要
申请公布号
CH274309(A)
申请公布日期
1951.03.31
申请号
CHD274309
申请日期
1948.08.19
申请人
CALUMET AND HECLA CONSOLIDATED COPPER COMPANY
发明人
CALUMET AND HECLA CONSOLIDATED COPPER COMPANY
分类号
B21C37/20
主分类号
B21C37/20
代理机构
代理人
主权项
地址
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