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Check company, site and product certificates - Validation and Verification

W T Knowles & Sons Ltd
Ash Grove Works
Elland Road
Elland
HX5 9JA
United Kingdom

Certificate number: KM 00348
Scope: Vitrified clay pipes & fittings

Standard/Scheme number or name	Start Date	Expiry Date
BS 65	1954-12-31	2026-12-31

Certificate number: KM 21973
Scope: Vitrified clay pipe systems for drains and sewers

Standard/Scheme number or name	Start Date	Expiry Date
BS EN 295	1993-04-14	2026-12-31