Mechanical Calculators are well known since anchient times. These machines always uses spinning wheels or levers to find the result. They could be compared to the complex mechanismns of some watches. Usually this machines were operated by spinning some crank or pulling some lever, but there also models, which are operated by electrical engines.

please proceed to my mechanical calculators...

Electronic calculators uses electrical signals to prepare the result. As electrical pulses advances at nearly the speed of light, this units work very fast. The only mechanical parts were the keys for data input and an optional avalable printing unit.

The early models look very similar to the new ones, only the size and weight was greater.

please proceed to my electronic calculators ...

Here is a company list and their products that i have in my collection.
 

In my Calculator Logbook you can read about new items, restorations and interesting informations that i want to share with you.

please proceed to my calculators logbook...