These are called Schuh- or Stiefel(ab)kratzer and where very common in ( or better outside of) houses until a few decades ago. When outside work was more common you would scrape your dirty boot soles over these things to avoid dragging dirt into your home. https://de.m.wikipedia.org/wiki/Schuhabkratzer
There are more modern ones with just brushes. Sometimes it’s just a single plate. You will see all types around the cities.
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To clean your shoes.
These are called Schuh- or Stiefel(ab)kratzer and where very common in ( or better outside of) houses until a few decades ago. When outside work was more common you would scrape your dirty boot soles over these things to avoid dragging dirt into your home.
https://de.m.wikipedia.org/wiki/Schuhabkratzer
There are more modern ones with just brushes. Sometimes it’s just a single plate. You will see all types around the cities.