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发明名称
EARTH AUGER BIT
摘要
申请公布号
JPS60168896(A)
申请公布日期
1985.09.02
申请号
JP19840023270
申请日期
1984.02.09
申请人
NIHON TUNGSTEN KK
发明人
SORA NORIYUKI;NAKANO KAZUTO
分类号
E21B10/44
主分类号
E21B10/44
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