DIN 19594-1
DIN 19594-1 Gully tops 300 × 500 for road gullies, class C 250 - Part 1: Summary
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