Description  Claims  Cited references 

WO9722680A   [0004] 
US4430243A   [0009] 
US5246621A   [0010] 
US5244594A   [0010] 
EP549272A   [0010] 
US5227084A   [0011] 
US5194416A   [0011] 
US5114606A   [0012] 
US5114611A   [0013] 
EP14176133A   [0068]  [0129] 
EP1524313A   [0085] 
WO2005095570A   [0113] 
GB1131738A   [0115] 
US2549539A   [0115] 
EP135226A   [0115] 
EP135227A   [0115] 
DE4315397   [0116] 
EP530870A1   [0116] 
EP697035A1   [0116]