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发明名称
AUDIO-VISUAL PRESENTATION DEVICE
摘要
申请公布号
GB1567788(A)
申请公布日期
1980.05.21
申请号
GB19770000419
申请日期
1977.01.06
申请人
MINNESOTA MINING & MFG CO
发明人
分类号
G03B31/04;G03B31/06;G09B5/06;G11B15/02;G11B31/00;(IPC1-7):G03B31/06
主分类号
G03B31/04
代理机构
代理人
主权项
地址
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