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The N.A.C.A. Combustion Chamber Gas-sampling Valve and Some Preliminary Test Results (1933)
NASA Technical Reports Server (NTRS) · leaf 16
N.A.C.A. Technical Note No.454 Fig.5 Figure 5.-Engine installation of N.A.C.A. gas-sampling valve.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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