Manhole steps. Part 1, Specification for galvanized ferrous or stainless steel manhole steps /
Manhole steps. Part 1, Specification for galvanized ferrous or stainless steel manhole steps /
British Standards Institution.
- 1 volume : illustrations ; 30cm.
- British standard ; BS 1247 : Part 1 : 1990 .
- British standard ; BS 1247 : Part 1 : 1990 .
Manholes--Standards.
Sewerage--Standards.
Stair building--Standards.
Manholes--Standards.
Sewerage--Standards.
Stair building--Standards.
