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发明名称
A piston ring and manufacturing method thereof
摘要
申请公布号
KR100618257(B1)
申请公布日期
2006.09.01
申请号
KR19990064358
申请日期
1999.12.29
申请人
发明人
分类号
C21D9/40
主分类号
C21D9/40
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代理人
主权项
地址
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