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Airplanes - Wings - Flexibility of plywood in aeroplane wings. Test designed to show strength of plywood under service conditions. Repeated bending for a period of 30 hours failed to show any signs of failure. Forest Products Laboratory, Madison, Wis

Airplanes - Wings - Flexibility of plywood in aeroplane wings. Test de...

Photographer: Forest Products Lab., Madison Airplanes - Wings Public domain photograph related to the United States in World War One, free to use, no copyright restrictions image - Picryl description

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