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The Denis-gruson Six-component Wind-tunnel Balance (1935)
NASA Technical Reports Server (NTRS) · leaf 7
N.A.C.A. Technical Menorandtira !To. 772 Figs. 1,2 … Figure 2.- Parallelogram "balance.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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