Description  Claims  Drawing  Cited references 

US2015070125A   [0003] 
EP2113928A   [0004] 
DE202006015609   [0005] 
EP1535386B1   [0007] 
DE641408   [0008] 
GB2161038A   [0008] 
JPS57117216B   [0008] 
US1473862A   [0008]