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经营范围
发明名称
Method and apparatus for forming a collar around a hole in a sheet metal blank
摘要
申请公布号
US4969345(A)
申请公布日期
1990.11.13
申请号
US19890306161
申请日期
1989.02.06
申请人
HOOGOVENS GROEP B.V.
发明人
ZONNEVELD, LOUIS M.;THOOLEN, FRIEDRICH W.
分类号
B21D19/04
主分类号
B21D19/04
代理机构
代理人
主权项
地址
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