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经营范围
发明名称
Буровая коронка
摘要
申请公布号
SU104513(A1)
申请公布日期
1955.11.30
申请号
SU19490392486
申请日期
1949.02.25
申请人
RUMYANTSEV N.P.
发明人
RUMYANTSEV N.P.
分类号
E21B10/46;E21B10/62
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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