Okidata Microline 420 9-Pin Dot Matrix Printer - Black.The OKI MICROLINE 420 9-pin printer and its wide-carriage counterpart ML421 are a quantum leap forward in Impact printer performance. Engineered for dedicated forms printing in the most demanding point-of-sale, automation and utility environments, ML420/421 printers are right at home in applications such as retail sales counters, medical facilities, automotive rental and repair shops, airline boarding gates, financial departments and manufacturing sites. Their print speed and versatile paper handling make them ideal for the office, too.