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经营范围
发明名称
THERMIONIC VALVE
摘要
申请公布号
CA457134(A)
申请公布日期
1949.05.31
申请号
CAD457134
申请日期
申请人
STANDARD TELEPHONES AND CABLES LIMITED
发明人
JOHN FOSTER
分类号
主分类号
代理机构
代理人
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地址
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