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The first camera was invented by Nicephorus Niepce.
His simple camera used a used paper coated with sliver chloride which would produce a negative of the image. Because of how sliver chloride works these images were no permanent. https://historycooperative.org/first-camera-the-history-of-cameras/ -
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Edmund Becquerel developed the first OHP.
https://en.wikipedia.org/wiki/Overhead_projector -
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