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280429 — Gasos nobles, excepte argó

    Descendants
    Code Description
    28042910 Heli
    28042990 Gasos nobles, excepte argó i heli
    Correspondence with NC 2016 (ca)
    Code Description
    280429 Gasos nobles, excepte argó
    Correspondence with NC 2018 (ca)
    Code Description
    280429 Gasos nobles, excepte argó