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发明名称
摘要
申请公布号
AU459348(B2)
申请公布日期
1975.03.06
申请号
AU19680045158
申请日期
1968.10.21
申请人
发明人
分类号
E21B47/024;E21B47/18
主分类号
E21B47/024
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代理人
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