The handheld electronic calculator was made possible by the development of VLSI integrated circuits (1000 to 10000 logic gates per chip).
Hewlett Packard introduced the first one with their HP-35 model.
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Hewlett Packard introduced the first handheld scientific calculator in 1972 and that became the first ever handheld computer to be invented.
The Curta calculator was the first handheld calculator. It was invented during WW2 by a prisoner in a Nazi concentration camp named Curta. The first model was intended as a gift for Hitler, but the war ended too soon Curta's were produced from about 1947 to 1976, when electronic handheld calculators killed Curta's market.
Because he designed the first mechanical computer.
No, it wasn't. The first calculator was called the pascaline.
They are most credited with building the prymids, and creating the first calanders