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Amgueddfa Cymru – Museum Wales
Blueprint - white text on blue paper. A graph with the title 'II STAGE TURBO - COMPRESSOR - 3000 R.P.M 80 LBS/ GAUGE / MESSRS. GUEST, KEEN & NETTLEFOLD LTD.' Dated 1. Dec. 19. Contained loose within a maroon hardback file with all other documents under accession number 85.184I/4.
