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发明名称
Sound transmission
摘要
申请公布号
US1835795(A)
申请公布日期
1931.12.08
申请号
US19290370815
申请日期
1929.06.14
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MASON WARREN P.
分类号
H04R1/22
主分类号
H04R1/22
代理机构
代理人
主权项
地址
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