Adlerwerke vorm. Heinrich Kleyer
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Adler (Adlerwerke vormals Heinrich Kleyer) - Adler works or Adler crafts formerly (known as) Heinrich Kleyer - was a German aircraft manufacturer established by Heinrich Kleyer in Frankfurt-am-Main in 1934 by buying out Gerner. Adler made no original designs, only continuing production of Gerner designs that were included in the acquisition.
Adler was also know as an automobile manufacturer, producing cars under the Adler name from 1899 to 1945, as well as a bicycle manufacturer from 1886 on.
Adler was also a well-known typewriter and office machine manufacturer from 1898 through 1969 at which point, Adler was acquired by Litton Industries.
The factory in Frankfurt-Gallus does still exist and was restored in late 1990s for use as an office building. It also houses the Gallustheater and a restaurant.