METALLURGIST EXAMINING ALLISON J-33 BUCKET BLADES
An NACA researcher uses a microscope to examine blades on a turbine wheel of a GE I-40 engine (1958).
Image Credit: NASA/Art Laufman
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https://www.nasa.gov/image-detail/grc-1948-c-22763/
Image CreditNASA/Art Laufman
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