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发明名称
Improvements relating to collar assemblies for mounting on well pipes or casings
摘要
申请公布号
GB872345(A)
申请公布日期
1961.07.05
申请号
GB19590014981
申请日期
1959.05.01
申请人
JESSE ELMER HALL;JOHN ALLEN HALL
发明人
分类号
E21B17/10;E21B37/02
主分类号
E21B17/10
代理机构
代理人
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