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发明名称
ROTARY DRILLING BIT
摘要
申请公布号
JPH0249888(A)
申请公布日期
1990.02.20
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
主权项
地址
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