Your article is fantastic. I had no idea that: > When the Type 80 sorter was introduced, standard AC power hadn't fully taken over and parts of the United Stat

Your article is fantastic. I had no idea that: > When the Type 80 sorter was introduced, standard AC power hadn't fully taken over and parts of the United States used DC or 25 Hertz AC.[9] Thus, the sorter needed to handle fifteen different line inputs including unusual ones such as 115V DC or 230V 25 Hertz AC.