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发明名称
Perfectionnements aux tubes thermoioniques
摘要
申请公布号
FR706921(A)
申请公布日期
1931.07.01
申请号
FRD706921
申请日期
1930.11.13
申请人
ARCTURUS RADIO-TUBE COMPANY
发明人
分类号
H01J19/42
主分类号
H01J19/42
代理机构
代理人
主权项
地址
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