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经营范围
发明名称
Ejector for core drills
摘要
申请公布号
US2414133(A)
申请公布日期
1947.01.14
申请号
US19460655640
申请日期
1946.03.19
申请人
BERNARD BARR WILLIAM
发明人
BARR WILLIAM BERNARD
分类号
E21B25/00
主分类号
E21B25/00
代理机构
代理人
主权项
地址
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