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Xah Lee on Twitter: "Maltron keyboard began in 1977. I think it's the first ergo with concave surface. and perhaps also the first ergonomic keyboard in West. Maltron Keyboard Review https://t.co/oxsCyzYwSZ #xahkeyboard
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8 uncommon keyboards to spice up your typing | TechCrunch
Kinesis Advantage 2 Ergonomic Keyboard - Wired, USB, Cherry MX Brown Switches, QWERTY Keyboards, Concave keywells, Thumb clusters, Smaller footprint, for Windows & Mac - KB600 at TigerDirect.com
Advantage2 Wired Ergonomic Keyboard for Mac & PC | Kinesis Keyboards