Einar Sem-Jacobsen

Einar Sem-Jacobsen (3 August 1878 – 15 October 1936) was a Norwegian military officer, engineer and aviation pioneer. He co-founded the society Norsk Luftseiladsforening in 1909. He was the manager of Hærens Flyvemaskinfabrikk at Kjeller from 1916 to 1922.