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发明名称
Voice amplifying device
摘要
申请公布号
US2402341(A)
申请公布日期
1946.06.18
申请号
US19440557409
申请日期
1944.10.06
申请人
ALLIED ENGINEERING CORPORATION
发明人
PATTERSON ALLEN L.
分类号
H04M1/215
主分类号
H04M1/215
代理机构
代理人
主权项
地址
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