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发明名称
DRILL BIT
摘要
申请公布号
SU581230(A1)
申请公布日期
1977.11.25
申请号
SU19731944033
申请日期
1973.07.06
申请人
VNII BUROVOJ TEKHNIKI
发明人
AKOPOV EDUARD A,SU
分类号
(IPC1-7):E21B9/02;E21B9/36
主分类号
(IPC1-7):E21B9/02
代理机构
代理人
主权项
地址
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