W. J. Blanchard, an inventor and respected Dayton businessman, co-founded Engineering Products, Inc. in 1935. The company was the first to develop a new propeller known as the "aeroprop". In 1940, General Motors Corporation purchased Engineering Products, renamed it Aeroproducts, and instilled Blanchard as its first General Manager. The collection consists of administrative records, engineering blueprints, aviation handbooks, and personal materials.