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发明名称
Roller bit
摘要
申请公布号
US2213351(A)
申请公布日期
1940.09.03
申请号
US19380235759
申请日期
1938.10.19
申请人
SMITH HERMAN C
发明人
SMITH HERMAN C.
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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