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经营范围
发明名称
Improvements in optical viewfinders
摘要
申请公布号
GB690309(A)
申请公布日期
1953.04.15
申请号
GB19510013686
申请日期
1949.06.29
申请人
ETABLISSEMENTS EMEL
发明人
分类号
G02B23/14
主分类号
G02B23/14
代理机构
代理人
主权项
地址
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