Description  Claims  Drawing  Cited references 

NO126927   [0014] 
GB1369915A   [0014] 
US3958426A   [0015] 
WO2006041312A   [0016]  [0018] 
US20040011424A   [0017] 
FR2252450   [0019] 
US4712944A   [0020] 
US2044795A   [0021]