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Handwritten in pencil on off-white, blue ruled paper. Two page document, containing notes and calculations relating to the Cefn Coed steam accumulator. Dated 16-12-32. Loose within a green card file with all other documents with accession number 83.184I/67. The file is labelled 'Colliery Boiler Plant B31', 'Cefn Coed Data' and 'Colliery Engineering'.
