BS 497-1:1976

Заменен

Specification for manhole covers, road gully gratings and frames for drainage purposes, Cast iron and cast steel — 12 стр.

Заменен на

BS EN 124:1994

ICS

13.060.30 Sewage. Including sewage water disposal and treatment / Сточные воды. Включая удаление и очистку сточных вод