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Pascal's calculator - Wikipedia
Pascaline | Mechanical Calculator, Addition Device, Subtraction
Blaise Pascal | Biography, Facts, & Inventions | Britannica
Pascaline Calculator Explained — Everything You Need To Know
Blaise Pascal - Wikipedia
Pascaline Calculator Explained — Everything You Need To Know
Blaise Pascal - World History Encyclopedia
History of Computing Science: The First Mechanical Calculator
Blaise Pascal - Computing History
Blaise Pascal and the World’s First Mechanical Calculator