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发明名称
STEEL TAPPING HOLE IN CONVERTER
摘要
申请公布号
JPH02310305(A)
申请公布日期
1990.12.26
申请号
JP19890129883
申请日期
1989.05.23
申请人
NKK CORP
发明人
YAMASE OSAMU
分类号
C21C5/46
主分类号
C21C5/46
代理机构
代理人
主权项
地址
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