Frederik Ferdinand Tretow-Loof by Jan Rømsgaard The Swede F.W. Lindqvist is credited with the invention of the wickless kerosene pressure stove - the "Primus" but in a recent book about the city of Hobro in Denmark the writer revealed the true father of the Primus was a Dane - Frederik Ferdinand Tretow-Loof (13 March 1845 - 21 January 1913). Below is part of an obituary from “The Clay Industry” & an English translation which mentions Tretow-Loof's invention of the "Primus" & his other achievements. My father bought the brick factory once owned by Tretow-Loof in 1946. I have run the factory since 1970 & live in a house built by him. The home of Tretow-Loof is today used as a Music School. I have found some of his descendants, have talked to them and have got some old pictures from the factory. He made the first public water supply in the city of Hobro and a lot of other things for the “small” man. In the forest next to me, we have a great memorial to Tretow-Loof made out of bricks erected in 1916.