File:Waterman Flex-Wing Aero Digest October,1930.jpg
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![File:Waterman Flex-Wing Aero Digest October,1930.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/60/Waterman_Flex-Wing_Aero_Digest_October%2C1930.jpg/800px-Waterman_Flex-Wing_Aero_Digest_October%2C1930.jpg?20190304160339)
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