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Intermittent-flow coefficients of a poppet valve (1939)
NASA Technical Reports Server (NTRS) · leaf 12
N.A.C.A. Technical Note No. 701 Figa. 1, 2 … Figure £f - Section through flow passage.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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