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经营范围
发明名称
Improvements relating to an optical slide projector
摘要
申请公布号
GB761549(A)
申请公布日期
1956.11.14
申请号
GB19530015676
申请日期
1953.06.08
申请人
DE VRY CORPORATION
发明人
分类号
G03B23/04
主分类号
G03B23/04
代理机构
代理人
主权项
地址
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