Model DW10 | A Collection of Mechanical Calculators
Electro-) mechanical calculators - technikum29
Friden Model STW-10 Electro-Mechanical Calculator
Friden Model STW-10 Electro-Mechanical Calculator
Friden Model STW 10 Electro Mechanical calculator. I used to service these machines in the early 1960's. | Mechanical calculator, Vintage electronics, Calculator