Description     Claims     Drawing  

US4990134A   [0008] 
US5681336A   [0008] 
US5938670A   [0008] 
US6015420A   [0008] 
US5217474A   [0010] 
US6096054A   [0010] 
US6676698B   [0011] 
US2002099367A   [0013] 
US5114399A   [0014] 
CN102670283   [0015]