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
Casio AB-550 Analog Digital Data Bank Watch How To Use Guide & Review - YouTube
Casio AT-550 Module 320 Janus Sensor Touch Calculator Vintage Watch For Parts | eBay
Casio Janus AT-552] Finally got the one watch I remember wanting most as a kid looking through old Casio adverts. Calculator watch you enter digits via drawing them on the screen, super
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