Dalton Adding Machine - Patented 1899-1912 ~ Introduced 1902

James Dalton, president of the Addograph Company, formed the Adding Typewriter Company that same year. It was later called the Dalton Adding Machine Company.

The Dalton was the first ten key adding machine. It went on to become one of the most popular 10 key adders of the time. Earlier models had glass inserts to allow customers to view the gears actually calculating the answers. By the 1920's over 150 models of Dalton had been designed.