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经营范围
发明名称
Valve with removable seat
摘要
申请公布号
US2654563(A)
申请公布日期
1953.10.06
申请号
US19470783107
申请日期
1947.10.30
申请人
GRAY TOOL COMPANY
发明人
MUELLER ROBERT A.;CRAIN ROBERT L.
分类号
E21B34/02;F16K43/00
主分类号
E21B34/02
代理机构
代理人
主权项
地址
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