| http://www.w3.org/ns/prov#value | - Tracking EngineMechanical TrackballsWith ball diameters from 16mm to 75mm & offering sealing up to IP65, the CCL range of Mechanical Trackballs incorporate tried & tested???.Optical TrackballsUtilising the latest generation solid-state optical tracking technology & no moving parts other than the ball itself, the CCL contactless???.Laser TrackballsIncorporating leading edge laser tracking technolog
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