D companies in Germany

[tastyminerals]

Not sure if this is the best place to ask but online search 
didn't provide much info.

I wonder which companies in Germany use D currently. Since I am 
living in Munich, I know only that "Funkwerk" uses D in prod (not 
sure to what extent though). What about "MaibornWolff GmbH" and 
"Valtech Mobility"? Do you know any other German company that 
uses D in production?