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What type of calculator did Sinclair produce for the first time in the world in 1972?

Graphing calculator
Scientific calculator
Slimline electronic pocket calculator
Solar-power calculator

Answer

The Sinclair Executive, introduced in 1972, was the world's first slimline electronic pocket calculator, revolutionizing the industry by making the previously bulky technology portable and accessible. Its compact design and affordability democratized access to computing power and marked a significant shift towards personal computing in everyday life.