An example of the Supremathic Calculatot made and patented in France, with original leather case (scuffed) and a rough copy of the original instructions in French
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Fletcher Wallis sells objects and books relating to the history of science, medicine and technology from his unit at Admiral Vernon Arcade Portobello Road. He publishes books through Vernier Press, including Antique Medicine Chests, and Corkscrew Patents from 1795. He has been dealing for thirty five years.