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发明名称
摘要
申请公布号
NL6511482(A)
申请公布日期
1967.03.03
申请号
NL19650011482
申请日期
1965.09.02
申请人
发明人
分类号
E21B43/01;F16L1/15
主分类号
E21B43/01
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代理人
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地址
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