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经营范围
发明名称
Relief valves
摘要
申请公布号
US2976883(A)
申请公布日期
1961.03.28
申请号
US19580724677
申请日期
1958.03.28
申请人
DOWTY MINING EQUIPMENT LIMITED
发明人
FRYE COLIN MICHAEL
分类号
E21D15/51;F16K17/04
主分类号
E21D15/51
代理机构
代理人
主权项
地址
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