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发明名称
Improvements in the production of sound records on films
摘要
申请公布号
GB359926(A)
申请公布日期
1931.10.22
申请号
GB19300022082
申请日期
1930.07.22
申请人
FIDELITY FILMS LIMITED;FREDERICK KENNETH CROWTHER
发明人
分类号
G11B19/28
主分类号
G11B19/28
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