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发明名称
Improvements relating to rubber protectors for drill pipes
摘要
申请公布号
GB738051(A)
申请公布日期
1955.10.05
申请号
GB19530013138
申请日期
1953.05.11
申请人
JESSE ELMER HALLS
发明人
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
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