Oki MICROLINE 421 Dot Matrix Printer (62418801) OKI MICROLINE 421 Dot Matrix Printer (9-pin) (570 cps) (128 KB) (240 x 216 dpi) (Max Duty Cycle 17 000 Pages) (Parallel) (USB) (Energy Star) OKI MICROLINE 421 Dot Matrix Printer (9-pin) (570 cps) (128 KB) (240 x 216 dpi) (Max Duty Cycle 17 000 Pages) (Parallel) (USB) (Energy Star) Matrix