Description  Claims  Drawing  Cited references 

US61788063A   [0001]  [0038]  [0052] 
US4734083A   [0006] 
US6454671B   [0017]  [0020]  [0052] 
US7025698B   [0017]  [0020]  [0052] 
US8303443B   [0020]  [0052] 
US2590975A   [0022]