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Vintage Charles Bruning Company “Binary” circular slide rule with its original fitted carrying case and instruction booklet. This large approximately 8-inch calculating instrument features numerous logarithmic, trigonometric, decimal, fraction and conversion scales, along with multiple transparent rotating cursor arms. One arm is marked “Copyrighted 1961.” The accompanying booklet is titled Instructions for Using the Binary Slide Rule and was printed in the USA for Charles Bruning Company, Inc.