The French School, Galgenbergstrasse in Tübingen, Germany.

The Alu/Wood „Top-Wing“ windows with IPA No. 21148 Vertically Reversible Projecting Gears and the Alu/Wood „Dreh-Wing“ windows with IPA No. 11197 Hinges, are made by:

Fenestra Fensterbau GmbH.
DE-69429 Waldbrunn-Schollbrunn