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发明名称
Sound record and apparatus therefor
摘要
申请公布号
US2220488(A)
申请公布日期
1940.11.05
申请号
US19380244237
申请日期
1938.12.06
申请人
LOTT PARKER M
发明人
LOTT PARKER M.
分类号
G11B9/00
主分类号
G11B9/00
代理机构
代理人
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地址
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