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发明名称
Frequency changer
摘要
申请公布号
US1758971(A)
申请公布日期
1930.05.20
申请号
US19250046674
申请日期
1925.07.28
申请人
THE STROMBERGCARLSON TELEPHONE MANUFACTURING COMPANY
发明人
POWELL WINFRED T.
分类号
H03B19/00
主分类号
H03B19/00
代理机构
代理人
主权项
地址
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