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Welsh: system gwybodaeth ar ffurf sgrîn a sain i gwsmeriaid
Welsh: Gorchymyn Sŵn o Larymau Tresmaswyr Clywadwy (Cymru) (Dirymu) a Rheoli Sŵn (Codau Ymarfer ar gyfer Safleoedd Adeiladu a Safleoedd Agored) (Cymru) 2017