Etrich was a short-lived aircraft manufacturer founded by Igo Etrich.
The company became part of Brandenburgische Flugzeugwerke in 1914, which then, in turn, became part of Hansa-Brandenburg.
Some of the planes were manufactured in Trautenau (today Trutnov, Czech Republic) and others in Liebau (today Lubawka, Poland).
Aircraft produced
References
Etrich Wikipedia(Text) CC BY-SA