Old Classroom Projector - 搜索图片

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YouTube > Computer History Museum
PowerPoint Demonstration: Overhead Projectors
YouTube · Computer History Museum · 22万次播放 · 2016年9月12日
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This Is What Technology Used to Look Like in Schools | Reader's Digest
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El Ojos Rojos: Imágenes que t…
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film projector - Every teacher slways had trouble getting it to work ...

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