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Semiconductors Changed The World

About 1970 the world of calculating machines rapidly changed from mechanical to electronic. Using a slide rule most of the time and electronic calculators not being allowed at school, I wasn’t aware at all of the changes that took place. I took the challenge to setup a small collection of well preserved and operational calculators which are representative for the changes that took place in that period. A few typewriters show that also in those products electronics took over part of the mechanical constructions.
If you are interested in more detailed information, have a look at http://www.vintage-calculators.nl/