NACA twin spool compressor, c. 1956.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
1956 NACA metallurgical services worker - photo
1951 NACA 20-inch compressor in lathe - photo
1956 NACA magnaflux inspection - photo
Massive screw compressor - photo
Supersonic wind tunnel compressor - photo
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