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发明名称
Многоступенчатое многошарошечное долото для проходки скважин
摘要
申请公布号
SU72458(A1)
申请公布日期
1947.11.30
申请号
SU19470359444
申请日期
1947.09.04
申请人
BEREZANSKIJ I.N.
发明人
BEREZANSKIJ I.N.
分类号
E21D1/06;E21B10/08
主分类号
E21D1/06
代理机构
代理人
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