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发明名称
Method and apparatus for recording and reproducing sound
摘要
申请公布号
US1939992(A)
申请公布日期
1933.12.19
申请号
US19290377148
申请日期
1929.07.10
申请人
GEORGE RAMSEY;DAVID STERN
发明人
LARSEN LOUIS G.
分类号
G11B3/04
主分类号
G11B3/04
代理机构
代理人
主权项
地址
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