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发明名称
Sound recording
摘要
申请公布号
US1768273(A)
申请公布日期
1930.06.24
申请号
US19270214434
申请日期
1927.08.20
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
TERRY ROY V.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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