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BS PD CEN/TS 13476-4:2013

Plastics piping systems for non-pressure underground drainage and sewerage. Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE). Guidance for the assessment of conformity
standard by BSI Group, 04/30/2013

BS PD CEN/TR 16931-5:2017

Electronic invoicing. Guidelines on the use of sector or country extensions in conjunction with EN 16931-1, methodology to be applied in the real environment
standard by BSI Group, 09/22/2017