Technical notes. 2639. Fatigue strengths of aircraft materials, axial-load fatigue tests on notched sheet specimens of 24S-T3 and 75S-T6 aluminum alloys and of SAE 4130 steel with stress-concentration factor of 1.5 [with list of refer ences]; by H. J. G rover. W. S. Hyler, and L. R. Jackson.

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