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发明名称
Acoustic device
摘要
申请公布号
US1907712(A)
申请公布日期
1933.05.09
申请号
US19320598117
申请日期
1932.03.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BEDELL EUAL H.
分类号
G10K11/172
主分类号
G10K11/172
代理机构
代理人
主权项
地址
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