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发明名称
Acoustic device
摘要
申请公布号
US2442791(A)
申请公布日期
1948.06.08
申请号
US19450614939
申请日期
1945.09.07
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
WENTE EDWARD C.
分类号
H04R7/20
主分类号
H04R7/20
代理机构
代理人
主权项
地址
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