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Sinclair Research
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=== Calculators === The [[Sinclair Executive]] was introduced in 1972 as the first calculator which could easily be carried in a pocket. It was also significantly cheaper than similarly featured 4-function calculators available at the time. The [[Sinclair Cambridge]] was launched in 1973 as a basic calculator and later in several enhanced versions supporting memory, advanced mathematical functions, and programmability. The [[Sinclair Scientific]] featuring trigonometric and logarithmic functions and employing [[Reverse Polish notation|Reverse Polish Notation]] was introduced in 1974.
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