What eventually became the Aeroproducts Propeller Company had its humble beginnings in 1935 as Engineering Projects, Inc. of Vandalia, Ohio. Engineering Projects was bought by General Motors in 1940 for a speculated price in the $500,000 range and renamed the Aeroproducts Division of GM. The company delivered only 73 of their novel "Unimatic" Aeroprop propellers in the month of December 1941, rising to 12,500 props in the month of February 1944. Aeroproducts evolved to become a Division of Allison in 1952, and eventually the propeller business was sold to Hamilton-Standard in 1990. The type certificate for its most modern propeller now resides with Pacific Propeller.

This Aeroprop artifact was used on a P-63A-10-BE Kingcobra that was powered by an Allison engine, another GM product. Although intended for World War II application, the aircraft was only later flown in combat by the French in Indochina, and was also adopted by civilian air racing enthusiasts.