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经营范围
发明名称
Well valve construction
摘要
申请公布号
US3068896(A)
申请公布日期
1962.12.18
申请号
US19590830770
申请日期
1959.07.31
申请人
GROVE MARVIN H
发明人
GROVE MARVIN H.
分类号
E21B34/02;E21B43/14
主分类号
E21B34/02
代理机构
代理人
主权项
地址
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