DIN 19583-1
DIN 19583-1 Gully tops 500 × 500 for road gullies - Class C 250 and class D 400 - Part 1: Summary
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/1996
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/1996