BSI BS MA 39-3
BS BS MA 39-3 1973-DEC-21 Specfcaton for Shps' Ladders Part 3 Ladders Steel Dog-Step
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Specifies the dimensions, design and construction, materials and quality of finish for steel dog-step ladders formed from a series of shaped rings welded to the ships' structure. These ladders are intended for use in trunks, deep tanks, cargo oil tank bottoms, etc.