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经营范围
发明名称
Gas lift valve
摘要
申请公布号
US2691383(A)
申请公布日期
1954.10.12
申请号
US19500176011
申请日期
1950.07.26
申请人
CHURCH WALTER L
发明人
CHURCH WALTER L.
分类号
E21B43/12
主分类号
E21B43/12
代理机构
代理人
主权项
地址
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