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发明名称
Photographic sound recording apparatus
摘要
申请公布号
US2237904(A)
申请公布日期
1941.04.08
申请号
US19400348859
申请日期
1940.07.31
申请人
KLANGFILM G.M.B.H.
发明人
HACK ERNST
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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地址
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