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经营范围
发明名称
Apparatus for recordation and reproduction of sound
摘要
申请公布号
US1845987(A)
申请公布日期
1932.02.16
申请号
US19300500660
申请日期
1930.12.06
申请人
WALTER RICHMOND
发明人
RICHMOND WALTER
分类号
H04R11/08
主分类号
H04R11/08
代理机构
代理人
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