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发明名称
Plunger arrangement for closing well casing
摘要
申请公布号
US2788856(A)
申请公布日期
1957.04.16
申请号
US19550510995
申请日期
1955.05.25
申请人
ESSO RESEARCH AND ENGINEERING COMPANY
发明人
ORTLOFF JOHN E.
分类号
E21B33/06
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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