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Brian Roemmele on Twitter: "It was 1982 and the Casio's AT-550 was the first consumer hand recognition device and first consumer touch screen device, built into a calculator watch with an analog
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Nerd Watch Museum: Calculator Watches, Part One | Vintage Electronics Have Soul – The Pocket Calculator Show Website
![Brian Roemmele on Twitter: "It was 1982 and the Casio's AT-550 was the first consumer hand recognition device and first consumer touch screen device, built into a calculator watch with an analog Brian Roemmele on Twitter: "It was 1982 and the Casio's AT-550 was the first consumer hand recognition device and first consumer touch screen device, built into a calculator watch with an analog](https://pbs.twimg.com/media/ELO6awoUcAA6xcB.jpg)
Brian Roemmele on Twitter: "It was 1982 and the Casio's AT-550 was the first consumer hand recognition device and first consumer touch screen device, built into a calculator watch with an analog
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