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发明名称
Improvements in or relating to well tools
摘要
申请公布号
GB652469(A)
申请公布日期
1951.04.25
申请号
GB19480023632
申请日期
1948.09.08
申请人
MCGAFFEY-TAYLOR CORPORATION
发明人
分类号
E21B33/14
主分类号
E21B33/14
代理机构
代理人
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