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US6497677B   [0002] 
US4964851A   [0002] 
US6547756B   [0002] 
US6257847B   [0002] 
US4929229A   [0003] 
US8070716B   [0003] 
US20110301532A   [0003] 
EP1430918A   [0004] 
CH2012000222W   [0005] 
US20120022451A   [0006] 
DE102008062532A1   [0007] 
DE3344196A1   [0008] 
WO2012081228A1   [0009] 
WO2008141471A   [0015] 
WO2007085100A   [0015]