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[[Image:EAN-13-ISBN-13.svg|thumb|220px|ISBN represented as [[European Article Number|EAN-13 bar code]] showing both machine-readable bars and human-readable digits]]
Common machine-readable technologies include magnetic recording, processing [[waveform]]s, and [[barcode]]s. [[Optical character recognition]] (OCR) can be used to enable machines to read information available to humans. Any information retrievable by any form of energy can be machine-readable.
Examples include: *[[Acoustics]]
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