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经营范围
发明名称
Electrical circuit device
摘要
申请公布号
US2229861(A)
申请公布日期
1941.01.28
申请号
US19380237550
申请日期
1938.10.28
申请人
THE BELL & HOWELL COMPANY
发明人
MCNABB JOSEPH H.
分类号
G03B19/18
主分类号
G03B19/18
代理机构
代理人
主权项
地址
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