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DE2931579C2   [0002] 
DE3220701A1   [0003] 
DE3247761C2   [0004] 
DE4206525C2   [0005] 
DE1073001B   [0006] 
DE102008042620B4   [0007] 
WO2014056711A1   [0008] 
EP1033245A1   [0010] 
DE10160734A1   [0011] 
DE19924997A1   [0012] 
DE69307643T2   [0013] 
DE19958252A1   [0014] 
DE29805201U1   [0015] 
US4452139A   [0016] 
EP2008815A2   [0017]