• 

  1. Preis Viessmann Werke GmbH & Co. KG

  https://web.archive.org/web/20101124224604/http://www.industrie-energieeffizienz.de/energy-efficiency-award/energy-efficiency-award-2010/1-preis-viessmann-werke-gmbh-co-kg.html

  Keine Beschreibung vorhanden.

• 

  1. Preis Viessmann Werke GmbH & Co. KG

  https://web.archive.org/web/20101124224604/http://www.industrie-energieeffizienz.de/energy-efficiency-award/energy-efficiency-aw

  Keine Beschreibung vorhanden.

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