Description  Claims  Drawing  Cited references 

US3482488A   [0004] 
EP2286681B1   [0005] 
WO2016139198A   [0006]  [0016]  [0017] 
US3545345A   [0016] 
US3623404A   [0016] 
DE1432720B2   [0016] 
EP0568278B1   [0016]