Rolf Schulz, Concrete Technician, Construction Engineering Office, Munich
Repenning und Sohn GmbH, preservation of buildings, Berlin
Restaurierung am Oberbaum GmbH, Restoration Office, Berlin
David Chipperfield Architects, Berlin
Betonretusche Süd/West GmbH, Retouching of architectural concrete, Freising, Düsseldorf.
FEAD GmbH, Laboratory and office for research and development in heritage, Berlin