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发明名称
Well control device
摘要
申请公布号
US2257523(A)
申请公布日期
1941.09.30
申请号
US19410374383
申请日期
1941.01.14
申请人
B. L. SHERROD
发明人
COMBS CHESTER A.
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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