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经营范围
发明名称
Acoustic device
摘要
申请公布号
US1862582(A)
申请公布日期
1932.06.14
申请号
US19280296971
申请日期
1928.08.02
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
SCHLENKER VESPER A.
分类号
H04R7/08
主分类号
H04R7/08
代理机构
代理人
主权项
地址
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