31. Dot matrix printers are generally frowned on today : the printed letters look relatively rough edged. 32. The dot matrix printer was not very robust as its chassis was made entirely of plastic. 33. Dot-matrix printers were being superseded even as receipt printers after the end of the twentieth century. 34. Some dot matrix printers , such as the NEC P6300, can be upgraded to print in colour. 35. A character matrix printer has also been produced. 36. In 1970 Tally developed line matrix printer technologies and became a leader in the printer industry. 37. A company I used to work for used a dot-matrix printer for a great deal of printing. 38. And insofar as expense goes, I believe we paid about $ 550 for our last dot-matrix printer . 39. For example, it is occasionally used to describe the print head motion of certain dot matrix printers . 40. The machine came with a dot matrix printer , but, I told the seller to keep the printer.