Before revision: The best known are the European Charcoal Burners' Society (Europäische Köhlerverein) and the Glasofen Charcoal Burners' Society (Köhlerverein Glasofen).
After revision: These include the European Charcoal Burners' Society (Europäische Köhlerverein) and the Glasofen Charcoal Burners' Society (Köhlerverein Glasofen).