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发明名称
摘要
申请公布号
NL6408311(A)
申请公布日期
1965.01.26
申请号
NL19640008311
申请日期
1964.07.21
申请人
发明人
分类号
E21B10/12;E21B10/16;E21B10/28
主分类号
E21B10/12
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代理人
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地址
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