BS EN 14982+A1:2005 Plastics piping and ducting systems. Thermoplastics shafts or risers for inspection chambers and manholes. Determination of ring stiffness
2005BS EN 14982:2006+A1:2010 Plastics piping and ducting systems. Thermoplastics shafts or risers for inspection chambers and manholes. Determination of ring stiffness
2005BS EN 14982:2006 Plastics piping and ducting systems — Thermoplastics shafts or risers for inspection chambers and manholes — Determination of ring stiffness
2005BS EN 14982+A1:2005 Plastics piping and ducting systems. Thermoplastics shafts or risers for inspection chambers and manholes. Determination of ring stiffness