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发明名称
Arrangement for the background noiseless production of sound films
摘要
申请公布号
US2297392(A)
申请公布日期
1942.09.29
申请号
US19390309111
申请日期
1939.12.13
申请人
WALTER DALLENBACH
发明人
DALLENBACH WALTER
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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地址
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