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Printed in black ink on off-white paper. 'Pressure chart showing the operation of the accumulator plant at Cefn Coed Colliery. Amalgamated Anthracite Collieries Ltd. South Wales'. On the reverse there are some notes and sketches handwritten in pencil. 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'.
