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EP0035332A   [0008] 
US2011201727B2   [0009] 
EP0943634A1   [0010] 
WO2013057214A1   [0011] 
US3932335A   [0012] 
EP0561221A1   [0013] 
EP0686682B1   [0014] 
EP0035332B1   [0015] 
EP0640630B1   [0016] 
DE4329090   [0016]