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发明名称
RAILWAY POINTS DE-FREEZER
摘要
申请公布号
GB9120578(D0)
申请公布日期
1991.11.06
申请号
GB19910020578
申请日期
1991.09.27
申请人
LIPTROT JOHN
发明人
分类号
E01B7/24
主分类号
E01B7/24
代理机构
代理人
主权项
地址
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