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| 1925 | Fondation of locksmithery in Neunkirchen by Hans Krummenauer |
| 1930 | Acquisition of premises Wellesweilerstraße |
| 1934 | Accomplishment of first tract: Wellesweilerstraße, 20 employees |
| 1939 | Machinery expansion, 70 employees |
| 1945 | Resumption of work, 10 employees, support of rebuilding (e.g. “Blies bridge” and “Bahnhof bridge”) |
| 1946 | Main manufacturing sector: Production of steel constructions for „Regie des Mines de la Sarre“, for Saarland companies and for Lorraine mines. Structural changes are necessary: Expansion of facilities, new building of a construction hall etc. |
| 1947 | Installation of own oxygen-producing-system initially for internal use. Because of high demand of the industry and the lack of oxygen, KRUMMENAUER sells oxygen to other companies, especially the Saar-mines, in order to prenvent loss of production. |
| 1963 | Change to GmbH (limited liability company), director Hans Krummenauer (founder) |
| 1965 | Johann Alfred Krummenauer (son of founder) becomes director |
| 1971 | Expansion of production hall and machinery, 49 employees, Margot Weber (daugher of founder) becomes announced bord member |
| 1979 | Acquisition of premises Blücherflöz on the former area of mine „König” |
| 1982 | Hans Krummenauer jun. (grandson of founder) is announced board member |
| 1983 | Construction of new production hall (industrial premises „Grube König“) |
| 1991 | KRUMMENAUER establishes subsidiary in Katowice, Poland |
| 1994 | Walter Hemmer is announced board member |
| 2000 | Company split up into „KRUMMENAUER Anlagenbau GmbH“ (mining technology, engineering) and „KRUMMENAUER Torbau GmbH“ (door- and gate technology, steel construction) |
| 2006 | Elmar Krummenauer (great-grandson of founder) is announced board member |
| 2007 | Strengthening of exports to China, Russia, Australia, South Africa and USA |
| 2008 | Krummenauer establishes subsidiary in Beijing, China |
| 2008 | Krummenauer establishes subsidiary in Novokuznetsk, Russia |
