DescriptionK&E Slide Rules. DECI-LON: An Instruction Manual. Published by Keuffel & Esser Co., New York & Hoboken, [copyright 1962]. First edition, third printing. 8vo hardcover, blue-green cloth. pp. x, 185. Index. The DECI-LON (a trademark name that the company used capitalized) engineering - science slide rule depicted and explained was model 68 1100. "Third printing" is stated on page 186. K&E had their main office and factories in Hoboken when this item was issued. 8vo cloth