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发明名称
摘要
申请公布号
JPS5246747(B2)
申请公布日期
1977.11.28
申请号
JP19740119848
申请日期
1974.10.17
申请人
发明人
分类号
B21D37/14;B23B27/16
主分类号
B21D37/14
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