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发明名称
摘要
申请公布号
JPH0512516(B2)
申请公布日期
1993.02.18
申请号
JP19880199669
申请日期
1988.08.10
申请人
MURAZAKI KAZUO
发明人
MURAZAKI KAZUO
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
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