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US6768125B   [0004]  [0004] 
US8222621B   [0005]  [0049] 
US7276714B   [0006]  [0049]  [0076] 
US7777201B   [0006]  [0073] 
US9053906B   [0006]  [0061]  [0080] 
US9653263B2   [0028] 
US6858118B   [0032] 
US8198601B2   [0037] 
US9653263B   [0050] 
US9799487B   [0061] 
US7368738B   [0071]