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Superchargers (1931)
NASA Technical Reports Server (NTRS) · leaf 28
N.A.C.A. Technical Memorandum No.631 Figs. 4,15,16,19,20,21 Fig.16 Sectional photograph of the Bristol supercharger.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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