Description  Claims  Drawing  Cited references 

US5175401A   [0005] 
US6182787B   [0006] 
US5041323A   [0007] 
US4671841A   [0008] 
GB2349445A   [0009] 
EP0352993A   [0010] 
EP1111584A   [0011] 
EP2026325A   [0012]