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Book 3 – Acumath Self Teaching Instruction Manual No. 44, Mannheim Type Slide Rule. Acu-Rule Mfg. Co. Model 500.Book 4 – How to use the ASC Bellville Spring This book is the “Text Version” of Herman van Herwijnen's Slide Rule Catalogue. It is electronically available Acu Math 500. 3601. Generic slide rule. KEEP ISRM FREE!​​ History: Acu-Rule, Acu-Math, (and later Sterling Plastics) slide rules were made originally by Festus Mfg. Co., Festus, Missouri, in 1938 by The Acu-Math rules were produced in the United States by Acu-Rule Mfg. Co., Here a scan of the User Manual done by the International Slide Rule Museum: These Acu-Maths were made in U.S.A and have no copyright dates. Acu-Math 12: Compact light weight 5" white plastic simplex slide rule. Scales A, B, C, CI, D, LThe two Ginger Leather cases can accomodate a fairly narrow range of rules. The cases will fit most Pickett rules from 900/1010 to 500/800 size body styles, but The following features are exclusive with Acu-Math: Log log decimal trig slide rules available in one or two colors for easy instruction manual.