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Amgueddfa Cymru – Museum Wales
Carbon copy on cream paper. Two pages attached with a paperclip. One page contains nomograms and is entitled: 'Fixed furnaces. Nomograms for air for combustion: Prepared as a guide for use with fan blown combustion air.' The other page contains information re. the division of furnace gases to gas & air generators. Created by G.K.B Ltd, Cardiff Works drawing office. Dated 27-8-41.
