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发明名称
Drill bit
摘要
申请公布号
US2022055(A)
申请公布日期
1935.11.26
申请号
US19320626902
申请日期
1932.07.30
申请人
SANDERSON RAY R
发明人
SANDERSON RAY R.
分类号
E21B10/62
主分类号
E21B10/62
代理机构
代理人
主权项
地址
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