... grating , inlet grating , ISO9001-2000, GRATING SPECIALIST! Mr. David Huang trench grating ,Galvanized Gully grating ,inlet grating , ISO9001-2000, GRATING SPECIALIST ... flooring walkway, platform and steel structures, stair tread, well cover, trench cover, compound gratings, storage shelves, ladder, fences and handrail so ... -1985,Germany: DIN24537-1-2006, Japan: JIS (Mr. David Huang) trench grating