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发明名称
Acoustic device
摘要
申请公布号
US2058555(A)
申请公布日期
1936.10.27
申请号
US19340716076
申请日期
1934.03.17
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BETTS WALTER L.;JONES EDWARD H.
分类号
H04R1/30
主分类号
H04R1/30
代理机构
代理人
主权项
地址
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