These are two electrophotocopiers: ER-620KZ and ER-420R. Both working. To the maximum.
These “workhorses” are used in an office of the design institute “StavropolGrazhdanProekt”. In all next offices only modern devices are used. So what are the reasons they are still here? Because they never malfunction or run hot, they can work non-stop and never fail. Besides they can “eat” any paper and use violet balls with ink that are cheaper than ordinary cartridges for modern copiers. We believe they will serve many more years.