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发明名称
Object-glass with a variable focal length
摘要
申请公布号
US2609727(A)
申请公布日期
1952.09.09
申请号
US19490069285
申请日期
1949.01.05
申请人
ETABLISSEMENTS EMEL
发明人
LAURENT FRANCOIS
分类号
G02B15/14
主分类号
G02B15/14
代理机构
代理人
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