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.

The collection consists of large blueprints of structures and systems at the General Motors Aeroproducts Division plant located in Vandalia, Ohio. The majority of the blueprints date to 1940-1941, but later blueprints reflect the plant’s subsequent iterations as GM Allison Division, Inland Division, and Delco Products.