The day's ceety is a result o numerous incorporations o surroondin touns an smawer ceeties. It is the fifteent-lairgest ceety in Germany an the fift-lairgest ceety in North Rhine-Westphalie wi 495,668 residents as o 31 December 2007. The ceety is renouned for its steel industry. The last remainin coal mine closed doun in the simmer o 2009, but Duisburg haes niver been a coal-minin centre tae the same extent as ither places in the Ruhr region (German= Ruhrgebiet). Aw blast furnaces in the Ruhr are nou locatit in Duisburg. 49% o aw hot metal an 34.4% o aw pig-iron in Germany is producit here (as o 2000). It haes a lairge brewery an aw, the König Brauerei, locatit in Duisburg-Beeck, which maks the König Pilsener brand. The University o Duisburg-Essen, wi 37,000 students, ranks amang the 10 lairgest German varsities.