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发明名称
Bridging plug
摘要
申请公布号
US2241561(A)
申请公布日期
1941.05.13
申请号
US19400318519
申请日期
1940.02.12
申请人
LANE-WELLS COMPANY
发明人
SPENCER LLOYD
分类号
E21B33/128
主分类号
E21B33/128
代理机构
代理人
主权项
地址
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