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发明名称
Tool joint
摘要
申请公布号
US2239826(A)
申请公布日期
1941.04.29
申请号
US19400345460
申请日期
1940.07.15
申请人
HUGHES TOOL COMPANY
发明人
NEUHAUS RALPH
分类号
E21B17/042;E21B17/10
主分类号
E21B17/042
代理机构
代理人
主权项
地址
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