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Submission + - Barcodes are 60 years old today (bbc.co.uk)

another random user writes: Sunday the 7 October is the 60th anniversary of the barcode patent, filed in the US in 1952. However the distinctive black-and-white stripes did not make their first appearance in an American shop until 1974 — because the laser technology used to read them did not exist.
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Barcodes are 60 years old today

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We warn the reader in advance that the proof presented here depends on a clever but highly unmotivated trick. -- Howard Anton, "Elementary Linear Algebra"

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