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Records of the Diphwys Slate Quarry Company, Blaenau Ffestiniog, comprising financial records, 1909-1936; memorandum and articles of association, 1919; register of members etc., 1919-1926; directors attendance book and reports, 1919-1932; minute book, 1919-1936; daybook, 1920-1927; press letter book, 1935-1937; and photographs, [early twentieth century].