https://www.oktoberfest.de/en/magazine/eat-and-drink/the-six-munich-breweries-at-oktoberfest
This are the Munich breweries at the Oktoberfest in Munich - Oktoberfest.de
May 8, 2026 - There are currently six Munich breweries: Only beer of this Munich breweries may be served on the Wiesn, as custom dictates.
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