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Gyroscopic Instruments for Instrument Flying (1938)
NASA Technical Reports Server (NTRS) · leaf 39
N. A.C.A. Technical Note No. 662 Figs. 1,3 Hi w S P Figure I..- Diagrsm of gyroscopic furn indicator. K/nperctfurc chorr?be>NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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