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经营范围
发明名称
Percussion bit
摘要
申请公布号
US3388756(A)
申请公布日期
1968.06.18
申请号
US19650443511
申请日期
1965.03.29
申请人
VAREL MANUFACTURING COMPANY
发明人
VAREL DANIEL W.;BRONSON CHARLES L.;SHIELDS DARVIN D.
分类号
E21B10/56
主分类号
E21B10/56
代理机构
代理人
主权项
地址
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