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发明名称
Устройство для бурения скважин больших диаметров
摘要
申请公布号
SU120798(A1)
申请公布日期
1958.11.30
申请号
SU19580604402
申请日期
1958.07.21
申请人
BASHKATOV D.N.
发明人
BASHKATOV D.N.
分类号
E21D1/06;E21B17/22
主分类号
E21D1/06
代理机构
代理人
主权项
地址
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