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| selected references siren warning system dresden planing, delivery and project management stage 1 / 2006, 27 sirens, 1 control center stage 2,3 / 2007-10, 162 sirens stage 4 / 2011, 15 sirens siren warning system research Rossendorf planning, delivery and project management 2007, 4 sirens, 1 control center Flood warning system Chemnitz overall planing of the system 2011, 12 sirens mobile display and communication system for the Sparkasse Erzgebirge, 2006 stadium sound & wireless scoreboard 2008, new stadium VFB Annaberg 2009, new stadium FC Stollberg |