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发明名称
Improvements in the production of sound records on films
摘要
申请公布号
GB377694(A)
申请公布日期
1932.07.22
申请号
GB19320000488
申请日期
1931.04.22
申请人
FIDELITY FILMS LIMITED;FREDERICK KENNETH CROWTHER
发明人
分类号
G11B7/00
主分类号
G11B7/00
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