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DE102007033575A1   [0003] 
US4309620A   [0004] 
DE2436546A1   [0004] 
US2011106359A1   [0004] 
US2010184549A1   [0004] 
DE639717A   [0005] 
AT147860B   [0006] 
DE102010007632A1   [0007]