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发明名称
摘要
申请公布号
JPS55500541(A)
申请公布日期
1980.08.21
申请号
JP19790501202
申请日期
1979.07.31
申请人
发明人
分类号
E21B43/34;E02B15/04;E02B15/10
主分类号
E21B43/34
代理机构
代理人
主权项
地址
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