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经营范围
发明名称
Bridging plug
摘要
申请公布号
US2753942(A)
申请公布日期
1956.07.10
申请号
US19480040252
申请日期
1948.07.23
申请人
LANE-WELLS COMPANY
发明人
GARDINER JOHN T.
分类号
E21B23/06
主分类号
E21B23/06
代理机构
代理人
主权项
地址
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