Music Museums with a Focus on Bowed String Instruments

Which museums with a focus on bowed string instruments are there in Germany?

The German Music Information Centre (miz) lists musical instrument museums and collections of bowed string instruments that are either independent or appear as departments of larger institutions, e.g. state, regional or city museums, museums with a cultural-historical focus or universities. In addition to these institutions, there are other museums that exhibit musical instruments within the context of other topics; The miz does not take these into account due to their usually small collection size.