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16 key keyboard module, rectangular MCU keyboard with 4 x 4 keys, lightweight and portable, comfortable with large keys.: Amazon.de: Computer & Accessories
Build a Play-Along Keyboard - Circuit Cellar
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4x4 Keyboard MCU Board Matrix Array Switch Keyboard 16 Keys Matrix Array Switch Keyboard for Single Chip Microcontroller with 4x4 Push Buttons External Large Keyboard: Amazon.de: Computer & Accessories
microcontroller - What ASIC/MCU is in my keyboard? - Electrical Engineering Stack Exchange
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