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Alterations and Tests of the "Farnboro" Engine Indicator (1930)
NASA Technical Reports Server (NTRS) · leaf 19
N.A.C.A. Technical Note No,348 Fig. 5 … Modified design Fig,5 Enlarged view of original design of disks and seats as contrasted with modified design,NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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