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发明名称
Rock bit
摘要
申请公布号
US2200482(A)
申请公布日期
1940.05.14
申请号
US19380224747
申请日期
1938.08.13
申请人
CECIL WINSLOW CHARLES
发明人
WINSLOW CHARLES CECIL
分类号
E21B10/10
主分类号
E21B10/10
代理机构
代理人
主权项
地址
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