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Microsoft Trackball Optical - Mouse, trackball - optical - 5 button(s) - wired - PS/2, USB - retail: Amazon.co.uk: Computers & Accessories
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Kensington Expert Mouse - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Scroll Ring, Ambidextrous Design and Optical Tracking - Grey (64325) : Amazon.co.uk: Computers & Accessories
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