"From the beginning, the Wales Adding Machine Company of Wilkesbarre, PA was a strong competitor of Burroughs. The innovative Wales featured visible results above the keyboard. At one point, more than 40 different models of varying carriage width, number of places and auxiliary keys existed, but in 1923, the line was consolidated into two main classifications - the large machines, and the small portable models."
Source: Dr. Tim Bergin American University Computer History Museum - Mechanical Computing

X-Number World of Calculators