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DE102008030783B1   [0002] 
US6414785B1   [0003] 
US4767188A   [0004] 
US20120019798A1   [0005] 
US2009045699A1   [0006] 
US6498892B1   [0007] 
US3981566A   [0008] 
US4686440A   [0009] 
US20030231412A   [0010] 
DE102008030783B3   [0031]