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The Sonic Altimeter for Aircraft (1937)
NASA Technical Reports Server (NTRS) · leaf 107
Figs. 2,3,4 N.A.C.A. Technical Note No. 611 … Figure 4,- Loudspeaker installation Figure 3.- Florisson-SCAk (Nandillon) Ref. 11 visual-acoustic coincidence altimeter. Ref. 18NASA Technical Reports Server (NTRS)
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