Object: Calculator (electromechanical calculator) - UTSA Institute Of Texan Cultures
Facit NE electromechanical calculator - General Discussions - RobotShop Community
Friden Model STW 10 Electro Mechanical calculator. I used to service these machines in the early 1960's. | Mechanical calculator, Calculator, Computer technology
Mechanical calculator - Wikipedia
Model DW10 | A Collection of Mechanical Calculators