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  1. Probability theory by Pierre de Fermat and Blaise Pascal in the seventeenth century (with Gerolamo Cardano and Christiaan Huygens). Vernier scale by Pierre Vernier in 1631. Spirit level by Melchisédech Thévenot in 1661. Roberval Balance by Gilles de Roberval in 1669. Réaumur scale by René Antoine Ferchault de Réaumur in 1730.

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