lexmark t520
+20 PPM printing.
+Fastest time to first page in its class: < 9 seconds!
+Highest duty cycle 100K!
+Best price performance .
+Up to 1200 x 1200 dpi user-selectable print resolution.
+crisp text and graphics.
+Largest maximum input capacity .
+Optional two-sided printing - standard on T520d, T520dn
models - at optimised speed.
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lexmark t620
+ 30 PPM printing.
+Fastest time to first page in its class: less than 10 seconds!
+ Processor 300 MHz!
+Best price performance .
+ Up to 1200 x 1200 dpi user-selectable print resolution.
+Industry First on an A4 workgroup printer: optional* .
+StapleSmartTM stapling and offsetting unit for time saving,
professional finishing.
+Efficiency boosting multiple capacity paper handling options*,
including mailboxes.
+ Optional two-sided printing / standard on T620dn model.
+(up to 7 trays for a total maximum input of 4100 sheets)