[1] Graaff was a member of the German Bundestag from 4 July 1955, when he succeeded Robert Dannemann, until 8 May 1959 and from 1965 until his death in 1975.
From 15 June 1972 until the end of the legislative period, he was Chairman of the Bundestag's Economics Committee.
From the 1963 state elections until his resignation on 26 June 1963, he was a member of parliament in Lower Saxony (fifth term).
Biographisches Handbuch der Mitglieder des Deutschen Bundestages.
This biography article about a member of the German Free Democratic Party (FDP) is a stub.