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发明名称
摘要
申请公布号
NL6702483(A)
申请公布日期
1967.08.21
申请号
NL19670002483
申请日期
1967.02.17
申请人
发明人
分类号
E21B33/04;E21B33/043;E21B33/129
主分类号
E21B33/04
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