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经营范围
发明名称
Perfectionnements aux dispositifs amplificateurs à décharge électronique
摘要
申请公布号
FR707999(A)
申请公布日期
1931.07.17
申请号
FRD707999
申请日期
1930.11.10
申请人
发明人
JR. JOHN HAYS HAMMOND
分类号
H03G3/00;H03G3/20;H03G5/20;H03G5/22;H03G9/10;H04B1/62;H04R3/00
主分类号
H03G3/00
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代理人
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