black overhead projector ceiling conference room modern classroom color toned image |
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| navigate by keyword : background music business computer party border technology construction projector equipment light laser ceiling roof blue presentation plug projection room audience training seminar slide theater photography video viewer white working screen digital conference audiovisual classroom movie indoors grey gray cable lcd display education home audio overhead led hang learning film meeting |
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| A black overhead projector on ceiling in a conference room modern classroom color toned image |
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