


| 1971 |
formation of the engineering offices "Ingenieurbüro Dipl-Ing. Gerhard Duschl" in Kolbermoor, Bavaria, Germany |
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| 1971 | formation of a branch office in Rosenheim, Bavaria, Germany | |
| since 1989 | member of the "Union Beratende Ingenieure e.V." (Union of consulting engineers) | |
| 1991 | formation of a branch office in Munich, Germany | |
| 1995 | formation of subsidiary "INGPLAN TECHNIK GmbH" based in Chemnitz, Saxony, Germany | |
| since 1995 | member of the Bavarian Engineering Chamber (BayIkaBau): Dipl.-Ing. Gerhard Duschl - No. 11903 | |
| 1997 |
honorary appointment of Dipl.-Ing. Gerhard Duschl to the Advisory Committee of the University of Applied Sciences Rosenheim |
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| 1998 | formation of the Duschl Ingenieure Verwaltung GmbH based in Rosenheim, Bavaria, Germany | |
| 2001 | formation of branch office based in Erlangen, Bavaria, Germany | |
| 2003 |
formation of the subsidiary engineering offices Duschl Ingenieure GmbH & Co KG Duschl Ingenieure Project GmbH & Co KG based in Rosenheim, Bavaria, Germany and formation of a branch office based in Frankfort on the Main, Hessen, Germany |
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| 2004 | formation of a branch office based in Merano, Southern Tyrol, Italy | |
| since 2005 | member of Bavarian Engineering Chamber (BayIkaBau): Dipl.-Ing. Andreas Duschl - No. 13131 | |
| since 2006 |
Associate lecturers of the University of Applied Sciences Rosenheim: Dipl.-Ing. Gerhard Duschl Dipl.-Ing. Andreas Duschl |
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| since 2008 |
members of German Association of Consulting Engineers (VBI) No. 5110725 - Dipl.-Ing. Gerhard Duschl No. 5110724 - Dipl.-Ing. Andreas Duschl No. 1011863 - Duschl Ingenieure GmbH & Co KG member of Deutsches Institut für Normung e.V. No. 7510000H - Duschl Ingenieure Project GmbH & Co KG |
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| since 2012 |
formation of the subsidiary engineering office Duschl Ingenieure Rhein-Main GmbH & Co. KG based in Gießen, Hessen, Germany |
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