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发明名称
摘要
申请公布号
JPS4837903(B1)
申请公布日期
1973.11.14
申请号
JP19690071656
申请日期
1969.09.11
申请人
发明人
分类号
B21B37/48;H02P5/46
主分类号
B21B37/48
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代理人
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