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发明名称
Буровая кольцевая коронка
摘要
申请公布号
SU149070(A1)
申请公布日期
1961.11.30
申请号
SU19600674198
申请日期
1960.07.19
申请人
发明人
GRAF L.E.;KOGAN D.I.;LITVINOV N.N.;MAZURENKO V.V.
分类号
E21B10/46
主分类号
E21B10/46
代理机构
代理人
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地址
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