compatible machine models | Lexmark models: T640, T640dn, T640dtn, T640n, T640tn, T642, T642dn, T642dtn, T642n, T642tn, T644, T644dn, T644dtn, T644n, T644tn; Huntress Corp. models: T642; Signal Corp. models: T642; Standard Register models: PL 5835M, PL 5850M |