Even in the 20th century, charcoal burners in remote areas like the Harz Mountains and the Thuringian Forest, still used a Hillebille, a large contraption of beechwood boards, used as alarm and signal device. This is commemorated in the name of a mountain ridge in the Harz, called Hillebille. Today the tradition of this old craft is mainly preserved in clubs and societies. The best known are the European Charcoal Burners' Society (Europäische Köhlerverein) and the Glasofen Charcoal Burners' Society (Köhlerverein Glasofen).