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Amgueddfa Cymru – Museum Wales
A memo from the Dinorwic Quarry Office, Llanberis sent to Mr Arfon Jones on the 24th January 1957, certifying that Arfon Jones has served his apprenticeship as a fitter at the Dinorwig Slate Quarries as from the period August 1951 and ending on the 29th August 1956 and signed by the Quarry Engineer Ifor Jones.
