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发明名称
Rolling disk bit
摘要
申请公布号
US2126079(A)
申请公布日期
1938.08.09
申请号
US19380186558
申请日期
1938.01.24
申请人
ZUBLIN JOHN A
发明人
ZUBLIN JOHN A.
分类号
E21B10/08;E21B10/12
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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