Description  Claims  Drawing  Cited references 

US4081578A   [0004] 
US4748192A   [0004] 
US5849168A   [0004] 
US0660160W   [0022] 
US4476293A   [0049]  [0054] 
US5077373A   [0049] 
US6518389B   [0049] 
US0660171W   [0068]  [0070] 
WO2007048145A2   [0068] 
US5114789A   [0068] 
US6383644B   [0070]