Split-flap display

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Notion

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Science and technology

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What Wikipedia says

A split-flap display, or a flap display, is a digital electromechanical display device that presents changeable alphanumeric text, and occasionally fixed graphics. They were (from the 1960s to 1990s) commonly used as public transport timetables in airports and railway stations.

Excerpt from the Wikipedia article “Split-flap display”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Cassiopeia sweet, Public domain, via Wikimedia Commons.