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Back in my first post I showed you the world's first trackball. I have now found the smallest trackball. It was made by a company named Donya (another japanese company). It uses a usb to connect to the computer and then you have to try to use this trackball that's as small as your fingertip to move the arrow. If you can understand Japanese you can buy one here:
If you can't understand Japanese here's a translated page:
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