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发明名称
Вертлюг для бурения скважин
摘要
申请公布号
SU91108(A1)
申请公布日期
1950.11.30
申请号
SU19500435267
申请日期
1950.09.27
申请人
ANTONOV N.V.
发明人
ANTONOV N.V.
分类号
E21B21/02
主分类号
E21B21/02
代理机构
代理人
主权项
地址
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