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经营范围
发明名称
Bore crown for percussion drilling
摘要
申请公布号
US2641446(A)
申请公布日期
1953.06.09
申请号
US19490078832
申请日期
1949.02.28
申请人
SANDVIKENS JERNVERKS AKTIEHOLAG
发明人
HAGLUND DIDRIK WILHELM;ELSTROM SVEN ERIK
分类号
E21B10/38;E21B10/58
主分类号
E21B10/38
代理机构
代理人
主权项
地址
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