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经营范围
发明名称
Perfectionnements aux systèmes radiotéléphoniques et analogues
摘要
申请公布号
FR686977(A)
申请公布日期
1930.08.01
申请号
FRD686977
申请日期
1929.12.20
申请人
MARCONI'S WIRELESS TELEGRAPH COMPANY LTD
发明人
分类号
H04B3/20
主分类号
H04B3/20
代理机构
代理人
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