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发明名称
Drill bit
摘要
申请公布号
US2025476(A)
申请公布日期
1935.12.24
申请号
US19300446275
申请日期
1930.04.22
申请人
SAMUEL RUSH ULYSSES
发明人
RUSH ULYSSES SAMUEL
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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