Welcome in the big world of small calculators

Small figures, no problem! But to add up large numbers you needed a pencil and sheet of paper. 
That time no private person or workshop could afford a real mechanical adding machine nor four function calculator. Those only were available for big companies, academical institutes or big banks. 
You can see - that was the same situation as today.

But with the cheap "calculator for all", most of all being produced by ADDIATOR company since 1920, everybody could buy and use an adder. The head was free for other things and result was ever correct.

Oooh ...I'm sorry. It's not so simple for me to translate to English! At the moment it's not intended to translate this sites to English or an other language. But I think with all the existing translating tools there is no necessity to offer a version in your language.