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Fatigue Testing of Wing Beam by the Resonance Method (1938)
NASA Technical Reports Server (NTRS) · leaf 27
N.A.C.A. Technical Note No. 660 ttg. 6 Figure 6.- Electromagnet of the Goodyear reciprocating motor.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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