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发明名称
Regulator valve
摘要
申请公布号
US2524264(A)
申请公布日期
1950.10.03
申请号
US19470744353
申请日期
1947.04.28
申请人
HYDRILL CORPORATION
发明人
KNOX GRANVILLE S.
分类号
E21B33/06;E21B34/02;G05D16/10
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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