Bar Code co-inventor N. Joseph Woodland and another student at Drexel, Bernard Silver, applied for their bar code patent in 1949 and it was issued in 1952.
EPA
obituary

Grandfather of the barcode dies at 91

Acoustic barcodes stuck on a shop window could bring up descriptions and prices for items in the window at a swipe.
Chris Harrison
barcode

Now hear this: Acoustic barcodes react to scratches

Image of Timothy Tuttiet's website.
QR Memories
innovation

Interactive tombstones give the dead new life online

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