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发明名称
THERMIONIC VALVES
摘要
申请公布号
CA545187(A)
申请公布日期
1957.08.20
申请号
CAD545187
申请日期
申请人
THE M-O VALVE COMPANY LIMITED
发明人
JAMES BELL
分类号
主分类号
代理机构
代理人
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