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GUTMANN started more than 70 years ago as a producer of light alloys and wire in the Franconian town of Weissenburg, Germany, and has become today an international group of companies employing over 1300 workers. Building Systems are designed for modern windows, doors, and curtain-wall systems that are optimized to the wide range of stylistic and design requirements expected by architects.


Schuco is the market leader for innovative building envelopes, stands for global expertise in facades, doors, windows and solar solutions. The company was establish in 1951 in East Westphalia, Germany and the head office is now located in Karolinenstr, Germany with more than 5,000 employees. Schuco have more than 12,000 partners worldwide, as well as architects, developers and investors with presence in more than 78 countries and a turnover of about 1.8 billion Euros in 2012.


KELLER AG from Luxembourg is a leading system manufacturer for design sliding doors and windows. KELLER impresses by its unmistakable design and by the quality of the manufacturing. All the technically brilliant details of a KELLER construction are “Made in Luxembourg” and justify the excellent image.