DescriptionK&E Slide Rules: A Self Instruction Manual. By Lyman M. Kells, Willis F. Kern & Jarmes R. Bland. Published by Keuffel & Esser Co., New York & Hoboken, [copyright 1955]; this edition not issued before 1962. First edition thus. 8vo hardcover, tan cloth.. pp. [iv], 126. Index. "For use with the following K&E Slide Rules: Log Log Duplex Decitrig, Jet Log Duplex Decitrig." the Jet Log slide rule was introduced in 1962 so this edition with the imprinted cover and title page reference to the Jet Log would place this printing as no earlier than 1962. Code number at foot of page 126: 41604. K&E had their main office and factories in Hoboken when this item was issued. 8vo cloth