Material relating to the factory and its manufacturing operations, belonging to Irvin E. Weber. According to secondary sources, Irvin E. Weber joined Kaufman in 1945. His father, Irvin K. Weber, had worked at Kaufman for 52 years, starting in 1909. Some of the material in this series belonged to Irvin K. Weber and subsequently to his son Irvin E. Weber. Includes much material, such as the compound sheets, that would have originated in the Laboratory, but concerned with ingredients and costs rather than formulae and mixing. Includes correspondence, ephemera, invoices, notes, memoranda, and clippings.