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发明名称
Improvements in or relating to electro-optical apparatus for receiving and indicating or recording acoustic signals and other sounds
摘要
申请公布号
GB392808(A)
申请公布日期
1933.05.25
申请号
GB19320027194
申请日期
1932.09.30
申请人
ERNST LEITZ G.M.B.H.
发明人
分类号
G11B7/00
主分类号
G11B7/00
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