Going to Dusseldorf. Anything Audio-Related Worth Checking Out?

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I am going to Dusseldorf on business next week, and wanted to know if there are any audio-related places or events worth checking out? I know there are high-end audio stores there, but I'm more interested in any interesting vintage audio boutiques, thrift shops, electronics supply stores where I can get parts like Siemens-MKV film-in-oil caps, vinyl records, or even a good bookstore, etc.
 
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