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经营范围
发明名称
Improvements in or relating to a rotary percussion drill
摘要
申请公布号
GB660816(A)
申请公布日期
1951.11.14
申请号
GB19480029913
申请日期
1948.11.17
申请人
THE TIMKEN ROLLER BEARING COMPANY
发明人
分类号
B28D1/14;E21B10/40
主分类号
B28D1/14
代理机构
代理人
主权项
地址
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