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发明名称
DRILL BIT
摘要
申请公布号
JPS5891287(A)
申请公布日期
1983.05.31
申请号
JP19810186152
申请日期
1981.11.20
申请人
TONE BORING:KK
发明人
MASAFUJI KAZUO
分类号
E21B10/46
主分类号
E21B10/46
代理机构
代理人
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