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发明名称
摘要
申请公布号	NL7000947(A)	申请公布日期	1970.07.27
申请号	NL19700000947	申请日期	1970.01.23
申请人		发明人
分类号	E21B33/076;(IPC1-7):E21B33/08;E21B7/12	主分类号	E21B33/076
代理机构		代理人
主权项
地址

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