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发明名称
Improvements in or relating to the construction of electron discharge tube used for the recording of sound
摘要
申请公布号
GB395799(A)
申请公布日期
1933.07.27
申请号
GB19320005259
申请日期
1932.02.22
申请人
FIDELITY FILMS, LIMITED;FREDERICK KENNETH CROWTHER
发明人
分类号
G11B7/00;H01J17/40
主分类号
G11B7/00
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代理人
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