File:Viessmann Headquarters.jpg
Summary
Author: Viessmann Werke GmbH & Co KG
Source: Viessmann Werke GmbH & Co KG
Licensing
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Author: Viessmann Werke GmbH & Co KG
Source: Viessmann Werke GmbH & Co KG
{{cc-by-sa-3.0}}
{{Copy to Wikimedia Commons|bot=Svenbot|priority=true}}