sentences:  In order to start a co-operation with the Finnish Air Force, the headquarters of Veljekset Karhumäki was moved to Kuorevesi.During World War II the company was merged into the "Valtion lentokonetehdas" company, manufacturer of a number of military aircraft.The Karhumäki brothers designed the Karhumäki Karhu 48B light airplane, of which a small number was produced during the 1950s.