It originated in the Klemm-Flugzeugwerke Halle that had been founded in 1934 as a branch of Leichtflugzeugbau Klemm in Böblingen. Its name changed to Siebel Flugzeugwerke when it was taken over by Friedrich Siebel in December 1937.
After World War II the company was revived as Siebel Flugzeugwerke ATG (SIAT) in West Germany in 1948, with its headquarters in Munich. In 1956, its headquarters were moved to Donauwörth and the company became WMD-Siebelwerke ATG (WMD/SIAT) in 1958 in cooperation with Waggon- und Maschinenbau GmbH Donauwörth (WMD). In 1968 the company was absorbed by Messerschmitt-Bölkow-Blohm after MBB became the major shareholder.
- Siebel Fh 104 Hallore, medium transport
- Siebel Si 201, STOL reconnaissance aircraft (prototype)
- Siebel Si 202 "Hummel" sportplane + trainer, 1938
- Siebel Si 204, transport + aircrew trainer
- DFS 346, research aircraft
- Gunston p.424
- Interessengemeinschaft Luftfahrtgeschichte im Luftsportverband Sachsen-Anhalt (Hrsg.): Dokumentation der 90-jährigen Geschichte der Luftfahrt und des Luftsports in der Region Halle (Saale), 1997
- Augsburger Allgemeine - In 100 Jahren vom Trasswerk zur Firma Eurocopter
- Gunston, Bill (2005). World Encyclopedia of Aircraft Manufacturers, 2nd Edition. Phoenix Mill, Gloucestershire, England, UK: Sutton Publishing Limited. ISBN 0-7509-3981-8.
- Media related to Siebel at Wikimedia Commons
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