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Amgueddfa Cymru – Museum Wales
Handwritten/drawn in black and green ink on off-white, grey lined graph paper. 'Low Pressure Steam Flow Chart Cefn Coed Colliery'. Two graphs, one graph is labeled 'worst possible condition' the other is labeled 'best possible condition'. 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'.
