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Amgueddfa Cymru – Museum Wales
Typed in purple ink on cream paper. Some details handwritten in ink. Four pages of notes entitled 'Re Mr. Tupholme's Letter'. Notes refering to turbo-compressors and compressed air production. Dated March 9th 1926. Loose within a beige/light brown card file labelled 'general information file, power generation' and 'compressed air production.'
