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| Keywords: Flying machine of de Groof.jpg en Man-powered ornithopter that was made by Belgian shoemaker Vincent de Groof's in 1874 ja ベルギーの 屋ヴィンセント・デ・フローフの人力オーニソプター（1874年） From Gaston Tissandier's 1886 book La Navigation Aérienne via Project Gutenberg http //www gutenberg org/files/28397/28397-h/28397-h htm author date PD-old Ornithopters | ||||
