Description  Claims  Drawing  Cited references 

US5972711A   [0010] 
WO9713136A   [0010] 
US6288379B   [0028]  [0029] 
US6866408B   [0062] 
US6084226B   [0062] 
US5840583B   [0062] 
US5796080B   [0062] 

The Electrical Engineering Handbook   [0034]