We have one object that Wilhelm Koch has been involved with.

If you would like to cite this person in a Wikipedia article please use the following template:

<ref name=CH>{{cite web |url=https://collection.cooperhewitt.org/people/18061097/ |title=Wilhelm Koch |author=Cooper Hewitt, Smithsonian Design Museum |accessdate=4 December 2021 |publisher=Smithsonian Institution}}</ref>