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发明名称
Fremgangsmaade og Apparat til Registrering af Lyd- eller Billedstrømme.
摘要
申请公布号
DK50585(C)
申请公布日期
1935.08.26
申请号
DKD50585
申请日期
1933.12.27
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
主分类号
代理机构
代理人
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