Notes: "The Addiator Arithma is a 6-column slide adder that is very small, very light (almost all aluminum), and definitely pocket-sized. Judging by the numbers of them out there, the Arithma seems to have struck just the right balance between capability and portability for a lot of people. Addiator made several other slide adders in this size (Addfeet Junior, Piccolo, Sub Zero) but the Arithma, being a straight 6-column decimal adder, seems to have been the most popular, by a large margin. "
