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发明名称
摘要
申请公布号
JPH0262995(U)
申请公布日期
1990.05.10
申请号
JP19880138669U
申请日期
1988.10.26
申请人
发明人
分类号
E21B12/06;E02D5/20;E02D7/00;E02D17/13;E02F5/02;(IPC1-7):E21B12/06
主分类号
E21B12/06
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