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发明名称
SPHEROIDAL GRAPHITE CAST IRON PIPE
摘要
申请公布号
KR1019830002401(B1)
申请公布日期
1983.10.25
申请号
KR1019800000848
申请日期
1980.02.29
申请人
发明人
分类号
主分类号
代理机构
代理人
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