HIGH SPEED FLUTTER BLADES - NARA - 17448048.jpg
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HIGH SPEED FLUTTER BLADES NARA 17448048, US National Archives series: Photographs Relating to Agency Activities, Facilities and Personnel, Images from the National Archives and Records Administration, US National Archives location: other, HIGH SPEED FLUTTER BLADES
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英国国立公文書館所蔵写真集成成成17448048、米国国立公文書館所蔵写真集成成成作品集成成成
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flutter high-speed impeller impelling tremolo