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Amgueddfa Cymru – Museum Wales
Full title - Messrs The Powell Duffryn Steam Coal Co. New Tredegar. Proposed Arrangement of New Air Cylinders to Existing Air Compressor Fitted with "Borsig" Valves. Scale ½ inch to 1 foot. Dated 9 Oct. 1912. Purple ink stamp bottom right of Yates & Thom. Ltd., Blackburn.
