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Amgueddfa Cymru – Museum Wales
Drawn and handwritten in pencil on graph paper. Two graphs drawn on one piece of graph paper. The smaller of the two graphs is entitled 'coal per unit' and refers to MD- (Middle Duffryn), and BNPH. The other, larger graph is entitled 'Diminishing value of plant at IT rate[?] of 5% on decreasing value' Loose within peach card file with other documents relating to Powell Duffryn Electrical System.
