Monroe Calculating Machine Company mechanical calculator Full keyboard Heavy metal design Manual mechanical system From the period 1930 – 1960 These types were: Manually operated (with a crank) Then later evolved into electric versions Important information about it It was used in: Accounting Banks Large companies It is characterized by combining: High accuracy Better speed than other old machines This large size, the size is shown in the pictures, because there are smaller sizes Weight approximately 15 kg For collectors and museum owners Electric 220 Price 1300 Location Jeddah