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...vements to this system over the years, including variable ride firmness ([[Hydractive]]) and active control of body roll ([[Citroën Activa|Activa]]). The latest [[Image:Hydrosoft.gif|right|250px|thumb|Diagram of the Hydractive system, showing centre spheres and stiffness valves]]

...models. Citroën has also developed several active suspension models (see [[Hydractive]]). A recently publicised fully active system from [[Bose Corporation]] u