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The precursor to a slide projector, it projected images printed on glass plates and showed them in darkened rooms.
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These were originally used by the U.S. military before entering schools and other organizations.
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This filmstrip viewer was a simple way to help individuals watch filmstrips at their own pace.
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The chalkboard was changed into an interactive whiteboard. This is a more interactive system that uses a touch-sensitive white screen, a projector, and screen.
