Artifact Details Title ACU-Math Concrete Calculator slide rule Catalog Number X891.88 Type Physical object Date 1970s Manufacturer Redi-Mix, Inc. Place Manufactured U.S. Identifying Numbers Model number 40 Dimensions overall: 3/8 in x 9 5/8 in x 1 5/8 in Category Pre-computer/slide rule Credit Gift of W. Thomas Wagner Lot Number X891.88