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发明名称
摘要
申请公布号
NL6411202(A)
申请公布日期
1965.03.29
申请号
NL19640011202
申请日期
1964.09.25
申请人
发明人
分类号
E01B11/54;H01B3/00;H01B3/44
主分类号
E01B11/54
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代理人
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