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发明名称
Утяжелитель бурового инструмента
摘要
申请公布号
SU64051(A1)
申请公布日期
1943.11.30
申请号
SU19420318559
申请日期
1942.10.19
申请人
MANKOVSKIJ G.I.
发明人
MANKOVSKIJ G.I.
分类号
E21D1/06;E21B17/00
主分类号
E21D1/06
代理机构
代理人
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