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Jun 3, 2016 - Back in the day, if you wanted to show an image to a large audience, you would use an overhead projector. This would shine a light through a transparency, which is a clear sheet with a black drawing

Technology in the study of light / Overhead projector to the LCD Projector — Hive

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HamiltonBuhl 127HL Overhead Projector 127-HL B&H Photo Video

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For powerful presentation capabilities, this overhead projector can brighten up any small room. With a 2000 lumen light output, this projector is

Model 16000 Overhead Projector, 2,000 lm, 14.5 x 15 x 27

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The Use and Operation of the Overhead Projector / L'Opération du rétroprojecteur

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3M 1700 CJ1 Overhead Transparency Projector - Tested & Works! SHIPS FREE!

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