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发明名称
Telephone responsive control for radio speakers
摘要
申请公布号
US1960214(A)
申请公布日期
1934.05.22
申请号
US19310516434
申请日期
1931.02.17
申请人
DERON ALEXANDER P
发明人
DERON ALEXANDER P.
分类号
H04M1/21
主分类号
H04M1/21
代理机构
代理人
主权项
地址
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