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发明名称
Electroacoustic system and means
摘要
申请公布号
US2535681(A)
申请公布日期
1950.12.26
申请号
US19490091762
申请日期
1949.05.06
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
JOHNSON KENNETH S.
分类号
H04M9/08
主分类号
H04M9/08
代理机构
代理人
主权项
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