Description
To further improve the speed and the price/performance ratio, in 1975, the Electrical Communication Laboratories (ECL) of Nippon Telegraph and Telephone Public Corporation (now NTT) began studies on the printing-hammer and paper-handling mechanisms, which were the keys to increasing printing speed. In 1976, they conducted partial prototyping of a printing machine with a speed of 1,500 lines/min; the unit was completed in 1977.
