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N.A.C.A. Stall-Warning Device (1938)
NASA Technical Reports Server (NTRS) · leaf 11
N.A.C.A. Fig. 3 … TEST H FIGURE 3- PRESSURE HEADS USED WITH STALL WARNING DEVfCE .NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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