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经营范围
发明名称
Improvements in or relating to optical sound recording systems
摘要
申请公布号
GB479846(A)
申请公布日期
1938.02.10
申请号
GB19360022028
申请日期
1936.08.10
申请人
KLANGFILM G.M.B.H.
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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