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    W T Knowles & Sons Ltd

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

    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