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发明名称
Improvements in and relating to the production of photographic sound records
摘要
申请公布号
GB440239(A)
申请公布日期
1935.12.23
申请号
GB19350015021
申请日期
1935.05.23
申请人
OTTO KURT KOLB
发明人
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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