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发明名称
MAKING METHOD OF PANTAGRAPH COLLECTOR'S FRICTION PLATE
摘要
申请公布号
KR1019890000850(B1)
申请公布日期
1989.04.11
申请号
KR1019850000172
申请日期
1985.01.12
申请人
发明人
分类号
主分类号
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