Description     Claims     Drawing  

US5735174A   [0002] 
US20090071271A1   [0003] 
US20010003924A1   [0004] 
GB2158177A   [0005] 
US3777578A   [0006] 
GB2006387A   [0007] 
US3475972A   [0007] 
GB2364760A   [0007]