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3x4 Phone-style Matrix Keypad : ID 1824 : $8.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Wireless Number Pads, Numeric Keypad Numpad 22 Keys Portable 2.4 GHz Financial Accounting Number Keyboard Extensions 10 Key for Laptop, PC, Desktop, Surface Pro, Notebook : Tools & Home Improvement
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