DIN 19594-2
DIN 19594-2 Gully tops 300 × 500 for road gullies, class C 250 - Part 2: Particulars
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2012
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2012