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The Cuecat: https://en.m.wikipedia.org/wiki/CueCat
Came at a time when there weren't barcodes everywhere and QR codes didn't exist yet. Companies had to publish Cuecat specific barcodes, it was much easier to just type in the URL by the time you figured out you could use it at all.
The man who holds the patent legally changed his name after it failed so he wouldn't be associated with it.
Went down the rabbit hole on this guy a bit. He went on to participate in the CyberNinjas audit of Arizona's ballots after the 2020 election. He claimed to have technology that could detect whether ballots had been folded in the mail, and claimed to detect bamboo in "fraudulent Chinese ballots".
He was such a kook, the other kooks rejected him.
I completely forgot these existed until you just mentioned it!
I think I still have one somewhere in a box of "I might need this" along with a parallel port ZIP drive and a bunch of FireWire cables.
You can cut one leg off an IC on the board and it becomes a regular barcode reader.
It also looks vaguely like a dildo, which is cool.
Ha, I had one and it's what first came to mind too. Pretty useless.