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Gweithwyr yn sefyll wrth ymyl gwyddiau wedi'u pweru ag ager. Tynnwyd y ffotograff gan John Thomas.

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Lines Bros factory in Merthyr Tydfil

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C.W.S. milk factory, Builth Wells

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C.W.S. milk factory, Builth Wells

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B. S. Bacon (Games) Ltd toy factory in Llanrwst