Description  Claims  Drawing  Cited references 

SE534724C2   [0011] 
US5386727A   [0013] 
SE535848C2   [0020] 
US6119353A   [0021] 
US2006144129A   [0022] 
US20120300060A   [0022] 
US20090070064A   [0022] 
US20080228436A   [0022]