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