Instructions for The Calculating Slide Rule, Made in Six Sizes 5, 8, 10, 15, 20, and 24 inch, and for The Rietz Rule (10, 15, 20 inch), The Universal Rule (10), The Precision Rule (10 inch). Sliderule.
From Tony Hutchinson, Seale, United Kingdom
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AbeBooks Seller since August 24, 2005