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vintage marble mouse the two button type. How do you scroll? I read press both buttons together but... : r/Trackballs
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Logitech Trackman Marble Trackball Mouse Wired USB Ergonomic Mouse for Computers, with 4 Programmable Buttons, Silver/Gray/Red - Newegg.com
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Amazon.com: Logitech Trackman Marble Trackball Mouse - Wired USB Ergonomic Mouse for Computers, with 4 Programmable Buttons : Electronics
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