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发明名称
Sound recording
摘要
申请公布号
US1763891(A)
申请公布日期
1930.06.17
申请号
US19280284244
申请日期
1928.06.09
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
JONES WARREN C.
分类号
H04R1/16
主分类号
H04R1/16
代理机构
代理人
主权项
地址
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