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1908
 Oscar Kjellberg receives the German imperial patent no. 231733: “Electrode and procedure for electrical soldering” and is therefore recognised as the inventor of the coated welding electrode. 1921 Seven Swedish and German partners establish the “Kjellberg Elektroden GmbH” in Berlin. Largest shareholder is the Swedish company ESAB with its general managing director Oscar Kjellberg. 1922 Upon Oscar Kjellberg’s suggestion the Kjellberg Elektro-Maschinen GmbH is established in Finsterwalde. The goal is to manufacture suitable welding generators for Kjellberg electrodes. 1923 The first welding generator Ke 200/1450 developed and built in Finsterwalde is presented at the spring fair in Leipzig. In Finsterwalde the production of welding electrodes starts. The oldest product is the rod electrode OK G2/1, which was used for repair welding. 1926 Due to the changed company profile the Finsterwalde-based business is renamed as Kjellberg Elektroden und Maschinen GmbH. 
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