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Bubbles, Belts, And Bulbs: How The Scantron Works | Hackaday
Web Content

Bubbles, Belts, And Bulbs: How The Scantron Works | Hackaday

Interesting · hackaday.com · generic

Many of us remember back in our school days taking tests and filling out answers on a Scantron sheet, those long rows of A, B, C, D, and E that had to be filled in with a #2 pencil. Ever wonder why…

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