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经营范围
发明名称
Improvements in or relating to gas control valves
摘要
申请公布号
GB689745(A)
申请公布日期
1953.04.01
申请号
GB19500001548
申请日期
1950.01.20
申请人
RONALD CALVERT;EVELYN NUTTALL
发明人
分类号
F16K5/02
主分类号
F16K5/02
代理机构
代理人
主权项
地址
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