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发明名称
Coring bit
摘要
申请公布号
US3032130(A)
申请公布日期
1962.05.01
申请号
US19570690982
申请日期
1957.10.18
申请人
ELZEY LLOYD J
发明人
ELZEY LLOYD J.
分类号
E21B10/02;E21B10/06
主分类号
E21B10/02
代理机构
代理人
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