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发明名称
OVERHEAD PROJECTOR
摘要
申请公布号
GB1277546(A)
申请公布日期
1972.06.14
申请号
GB19700025535
申请日期
1970.05.27
申请人
GERHARD RITZERFELD
发明人
GERHARD RITZERFELD
分类号
G03B21/132
主分类号
G03B21/132
代理机构
代理人
主权项
地址
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