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发明名称
Threadless interlocking coupling
摘要
申请公布号
US2249162(A)
申请公布日期
1941.07.15
申请号
US19390275784
申请日期
1939.05.26
申请人
NIELSEN ADOLPH E
发明人
NIELSEN ADOLPH E.
分类号
E21B17/04;F16B7/02
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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