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发明名称
Method and means for taking cores
摘要
申请公布号
US2316024(A)
申请公布日期
1943.04.06
申请号
US19400352854
申请日期
1940.08.16
申请人
STANDARD OIL DEVELOPMENT COMPANY
发明人
SEWELL BENJAMIN W.
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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