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发明名称
Producing apparatus for oil wells
摘要
申请公布号
US2248305(A)
申请公布日期
1941.07.08
申请号
US19380208106
申请日期
1938.05.16
申请人
RASMUSSEN SERVICE COMPANY
发明人
RASMUSSEN CHESTER A.
分类号
E21B34/14
主分类号
E21B34/14
代理机构
代理人
主权项
地址
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