Description  Claims  Drawing  Cited references 

CA2821292A1   [0003] 
US20100005734A1   [0004] 
EP2085690B1   [0005] 
DE247231C   [0006] 
US4228489A   [0007] 
CH58534A   [0008] 
US20140009940A   [0009] 
US5173002A   [0010] 
US6273662B1   [0011] 
DE2617166A1   [0012]