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N.A.C.A. Stall-Warning Device (1938)
NASA Technical Reports Server (NTRS) · leaf 10
Fig. 2 … Meter for observation Contacting 7777777 device Relay- Earning horn Figure 2.~ Diagram of stall warning device.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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