Description  Claims  Cited references 

US2007254973A1   [0004] 
EP1624006A1   [0005] 
US4148840A   [0035] 
US5196476A   [0035]  [0054] 
US5268418A   [0035] 
US5364906A   [0035] 
US6013731A   [0035] 
US3953393A   [0042] 
US4119586A   [0042] 
US4463107A   [0042] 
US5324774A   [0042] 
US5814699A   [0042] 
US7179882B   [0042]  [0045] 
US6624209B   [0042] 
EP0351614A   [0059]