https://www.qrcode.com/en/about/index.html
What is a QR Code? | QRcode.com | DENSO WAVE
You can learn about the QR Code's features and standards here.
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https://deviceatlas.com/device-data/devices/denso-wave
DENSO WAVE devices | DeviceAtlas
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https://www.qrcode.com/en/about/error_correction.html
Error correction feature | QRcode.com | DENSO WAVE
Even if a QR Code is partly smeared or damaged, it has the capacity to correct itself and restore the original data.
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https://www.qrcode.com/en/about/version.html
Information capacity and versions of QR Code | QRcode.com | DENSO WAVE
There are 40 versions of the QR Code. Details of these are explained here.
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