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发明名称
Самозатачивающаяся буровая коронка
摘要
申请公布号
SU115723(A1)
申请公布日期
1957.11.30
申请号
SU19490420410
申请日期
1949.08.19
申请人
KOJFMAN M.I.
发明人
KOJFMAN M.I.
分类号
E21B10/46
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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