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发明名称
DRILL BIT
摘要
申请公布号
JPS5883790(A)
申请公布日期
1983.05.19
申请号
JP19810181954
申请日期
1981.11.12
申请人
SUMITOMO DENKI KOGYO KK
发明人
YATSU SHIYUUJI
分类号
E21B10/56;E21B10/46
主分类号
E21B10/56
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