Siebel, originally Flugzeugbau Halle, was a German aircraft manufacturer founded in 1937 in Halle an der Saale. It was revived as Siebelwerke in 1948. In 1952, it merged with ATG to form Siebelwerke-ATG Gmbh (SIAT). In 1968, SIAT was absorbed by Messerschmitt-Bölkow-Blohm.
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