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发明名称
Sound recording
摘要
申请公布号
US1868321(A)
申请公布日期
1932.07.19
申请号
US19290404563
申请日期
1929.11.04
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HARRISON HENRY C.
分类号
G11B3/00
主分类号
G11B3/00
代理机构
代理人
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地址
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