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Slide Rule and Calculation Monographs: " U.K. Patent System and Selected Sliderule Patents 1735-1920 " , " Check Figures - A Once Ubiquitous Tool for Book-keepers "
Slide Rule and Calculation Monographs UK Patent System and Selected Sliderule Patents 17351920 Check Figures A Once Ubiquitous Tool for Bookkeepers Author:John Knott, Bruce Williams
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