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DE10209489A1   [0008] 
DE102008053178A1   [0008] 
DE102011122056A1   [0008] 
DE202009006290U1   [0009] 
EP1466670A1   [0009] 
DE102007048248A1   [0009] 
WO02078858A1   [0009] 
GB2160639A   [0010]