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发明名称
Loud speaking telephine instrument
摘要
申请公布号
US2542922(A)
申请公布日期
1951.02.20
申请号
US19460716023
申请日期
1946.12.13
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
GIANNINI GABRIEL M.
分类号
H04M1/62
主分类号
H04M1/62
代理机构
代理人
主权项
地址
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