THEY ARE PRODUCED BY A DIFFERENT SUPPLIER THAN THE 'NON ECO' SERIES. 12 MONTH WARRANTY! Compatible Printers: Lexmark OPTRA T640, T640DN, T640DTN, T640N, T642, T642DN, T642DTN, T642N, T642TN, T644TN, T644DN, T644DN, T644N Lexmark X 642E MFP, 644 MFP.
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