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发明名称
Method and apparatus for recording and reproducing sound waves
摘要
申请公布号
US1759581(A)
申请公布日期
1930.05.20
申请号
US19280285850
申请日期
1928.06.16
申请人
BERNARD KWARTIN
发明人
KWARTIN BERNARD
分类号
G11B7/00
主分类号
G11B7/00
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