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chad box n.
A metal box about the size of a lunchbox (or in some models a large wastebasket), for collecting the [chad] (sense 2) that accumulated in [Iron Age] card punches. You had to open the covers of the card punch periodically and empty the chad box. The [bit bucket] was notionally the equivalent device in the CPU enclosure, which was typically across the room in another great gray-and-blue box.
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