In the late 19th Century, oil burning engines were being made to provide power for all sorts of industrial processes. The fuel in the engines was ignited by a red hot glowing plug, which causes the fuel mixture to explode when it was compressed, like a diesel engine. To start the engines, one had to first heat up the glow plug, so a small handheld blow torch was developed for heating the glow plugs. Frans Lidqvist, a mechanic in an engine factory in Stockholm Sweden, saw the handheld blow torch, and thought of turning the flame upward, and using it as a portable stove. He got a Swedish patent on the stove, and started making them for friends and relatives.
This figure is from his 1919 Swedish patent. Soon he partnered with Johan Svensson, who owed a small workshop, and they started a company to make the stoves, which were sold under the name Primus in 1892. They soon sold the global marketing rights, and the Primus stove went worldwide. Primus stoves were sold worldwide in almost their original form through the 1960, then the rights were sold to Optimus, and they appeared as Optimus and Svea stoves. Today Primus makes advanced camping stoves that compete with the major brands for efficiency and light weight. The original Primus stove was celebrated on a Swedish stamp in 1984.