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发明名称
Improvements relating to core-drills for well-boring
摘要
申请公布号
GB330051(A)
申请公布日期
1930.06.05
申请号
GB19290010630
申请日期
1929.04.05
申请人
REUBEN CARLTON BAKER
发明人
分类号
E21B25/16
主分类号
E21B25/16
代理机构
代理人
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地址
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