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发明名称
Retractable pack-off device
摘要
申请公布号
US2338326(A)
申请公布日期
1944.01.04
申请号
US19400324481
申请日期
1940.03.18
申请人
GEORGE GREEN
发明人
GREEN GEORGE
分类号
E21B33/12
主分类号
E21B33/12
代理机构
代理人
主权项
地址
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