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Typed in black ink on off-white paper. A two-page letter from G.W.Alexander to E.L.Hann of Powell Duffryn House regarding the turbo altenator sets, dated 10 September, 1954. Letters 83.184I/65 (1-4) were pinned together. Loose within a beige/light brown file containing copies of the 'Metcalf papers' and documents relating to the 'Conversion of Turbo Compressor to Electrical Drive'.
