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发明名称
摘要
申请公布号
JPS6140494(U)
申请公布日期
1986.03.14
申请号
JP19840125088U
申请日期
1984.08.17
申请人
发明人
分类号
E02D3/12;E21B33/12;(IPC1-7):E21B33/12
主分类号
E02D3/12
代理机构
代理人
主权项
地址
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