Assembly Instructions for the Set-Up Stool Cassie Wood October 01, 2024 14:58 Updated Courtesy of the Bartholomew County Historical Society, Columbus Indiana. Circa 1940. Related articles How to Obtain an Assembly Manual Packaging Model 4-D: Cosco Two-in-One Step Stool, 1948 Models 740 to 749: The Cosco Step Stool and Chair, 1940 Replacement Treads for the 11120 Retro Step Stool