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Gyroscopic Instruments for Instrument Flying (1938)
NASA Technical Reports Server (NTRS) · leaf 40
N.A.C.JL. Technical Note No. 662 Figs.2,5 … Figure 2.- Photograph of Pioneer turn indicator. Figure 5.- Photograph of Sperry directi- onal gyro.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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