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发明名称
Control device for oil or gas wells
摘要
申请公布号
US1851894(A)
申请公布日期
1932.03.29
申请号
US19280317000
申请日期
1928.11.03
申请人
FRANKLIN H. HAMILTON;HENRY J. HICKEY
发明人
CLOUGH ALFRED N.
分类号
E21B33/06
主分类号
E21B33/06
代理机构
代理人
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地址
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