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US8260154B   [0044] 
US7636525B   [0044] 
US7266310B   [0044] 
US9020364B   [0045] 
US20150372764A   [0045] 
US7747177B   [0046] 
US8073345B   [0046] 
US9112614B   [0046] 
US9762379B   [0051]