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发明名称
摘要
申请公布号
JPS5023121(U)
申请公布日期
1975.03.15
申请号
JP19730076191U
申请日期
1973.06.27
申请人
发明人
分类号
E02D7/16;E21B15/00;F15B15/14;(IPC1-7):E02D7/16
主分类号
E02D7/16
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代理人
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