Scope and ContentK & E Ever-There Slide Rule No. 4097D. Simple Instructions for Use. Published by Keuffel & Esser Co., New York & Hoboken. Copyright 1937. Dated by owner on cover: June 7, 1937. Booklet, 5-7/8" wide x 8-3/4" high on bible paper, 20 pp. including covers, illustrated. Fold marks as typically found as previous owner would often fold item to store for easy reference inside slide rule case. As printed on the back cover: General Office and Factories, Hoboken, N.J.