كومبتوميتر (آلة حاسبة ميكانيكية)
Sign in to savethumb|upright=1.2|Model ST (1930s) thumb|upright=1.2|Prototype of the first all-electronic desktop calculator marketed by of the United Kingdom|UK
thumb|upright=1.2|Model ST (1930s) thumb|upright=1.2|Prototype of the first all-electronic desktop calculator marketed by of the United Kingdom|UK