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Printed in black ink on off-white paper, with some details handwritten in pencil and blue ink. A paper by Mr David in South Wales Vol 52, No.6. Three tables: the first is a table of 'Tests on 40,000 C.F.M. Turbo-Compressor', the second table contains the results of a test on Turbo compressor No.1 and the third table shows compressed air costs and output. Loose within beige/light brown card file containing information relating to Powell Duffryn Ltd.
