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发明名称
摘要
申请公布号
JPH0118719(Y2)
申请公布日期
1989.05.31
申请号
JP19840177442U
申请日期
1984.11.22
申请人
发明人
分类号
E21B33/12;(IPC1-7):E21B33/12
主分类号
E21B33/12
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代理人
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地址
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