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A comment on Ask HN: Most interesting tech you built for just yourself?. Parent comment

Re:Ask HN: Most interesting tech you built for just yourself? by Nextgrid on Friday April 28, 2023 @05:32AM (#35739221)
Made me think of Kartrak (an early optical barcode-like system for tracking rolling stock): https://www.youtube.com/watch?v=5K8UpMNYIPo
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