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发明名称
Auger-type drill bit
摘要
申请公布号
US2578593(A)
申请公布日期
1951.12.11
申请号
US19460706365
申请日期
1946.10.29
申请人
ORVILLE PHIPPS
发明人
PHIPPS ORVILLE
分类号
E21B10/54
主分类号
E21B10/54
代理机构
代理人
主权项
地址
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