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发明名称
Percussion drill bit
摘要
申请公布号
US2976944(A)
申请公布日期
1961.03.28
申请号
US19570686689
申请日期
1957.09.27
申请人
BASSINGER TOOL COMPANY
发明人
BASSINGER ROSS
分类号
E21B10/58
主分类号
E21B10/58
代理机构
代理人
主权项
地址
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