Description     Claims  

US20060051398A   [0008]  [0032] 
US5644002A   [0009] 
US4048256A   [0010] 
US4095600A   [0010]  [0010] 
US4122129A   [0010] 
WO20080055086A   [0011] 
WO2009042882A   [0012] 
EP0807653A   [0013] 
US3978185A   [0061]