By Tommy ,Fee Flowersand other British scientists developed "Keluosasi" computer
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The first mass-produced mechanical calculator was made by Charles Xavier Thomas, around 1920. The first mass-produced electronic calculator was probably the Sharp QT-8D, mass-produced in 1969.
It was invented in Middle Ages. Around 1300 AD.
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.
Writing and AlphabetsPaper and PensBooks and LibrariesThe First Numbering SystemThe First Calculator: The Abacus
it was an astronomical calculator. A form of mechanical analog computer. The nordon bombsight was also a form of mechanical analog computer.