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.

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