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发明名称
Acoustic device
摘要
申请公布号
US1757712(A)
申请公布日期
1930.05.06
申请号
US19260126312
申请日期
1926.07.31
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HARRISON HENRY C.
分类号
G10K13/00
主分类号
G10K13/00
代理机构
代理人
主权项
地址
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