Description  Claims  Drawing  Cited references 

GB262481A   [0004] 
US4154974A   [0005] 
US7075966B2   [0006] 
US7095777B2   [0007] 
US4182927A   [0008] 
DE19601115A1   [0008] 
US3686421A   [0008] 
WO2010114525A1   [0008]