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发明名称
Recording device
摘要
申请公布号
US2160909(A)
申请公布日期
1939.06.06
申请号
US19380214519
申请日期
1938.06.18
申请人
ROSS CECIL L
发明人
ROSS CECIL L.
分类号
G09B3/08
主分类号
G09B3/08
代理机构
代理人
主权项
地址
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