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Measurement of Altitude in Blind Flying (1934)
NASA Technical Reports Server (NTRS) · leaf 36
N.A.C.A. Technical Note No. 503 … Figure 3.- Diagram of Kolleman sensitive Figure 4 - Dial of sensitive altimeter. altimeter. Knob K controls adjustment of pointers and markers IL.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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