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发明名称
Improvements relating to the recording of sound
摘要
申请公布号
GB380850(A)
申请公布日期
1932.09.19
申请号
GB19320018647
申请日期
1931.03.19
申请人
BRITISH ACOUSTIC FILMS LIMITED
发明人
分类号
B21L11/00;G11B7/00
主分类号
B21L11/00
代理机构
代理人
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