HG/T 21527-2014
回转拱盖快开人孔
Quick open manholes with hinged dome cover
2014-07-09
HG/T 21526-2014
椭圆形回转盖快开人孔
Elliptical quick open manholes with hinged cover
2014-07-09
HG/T 21535-2014
回转盖快开手孔
Quick open handholes with hinged cover
2014-07-09
HG/T 21597-2014
回转拱盖快开衬不锈钢人孔(附条文说明)
Lining stainless steel rotary arch cover of quick opening manholes
2014-07-09
HG/T 21603-2014
回转盖快开衬不锈钢手孔(附条文说明)
Lining stainless steel rotary cover quick opening manholes
2014-07-09