00452nam a2200145Ia 4500008004100000082001000041082000800051245010500059245000800164260000800172300000900180942000800189999001900197952009000216231017s9999 xx 000 0 und d a624.1 bBSI 0a"Stairs, Ladders and Walkways - Part2: Code of Practice for the Design of Helical and Spiral Stairs" 0cBSI bBSI c30cm cREP c604034d604034 00104070aNITbNITd2023-10-17l0o624.1 BSIpNIT-2860r2023-10-17w2023-10-17yREP