Image: Pénaud's flying models
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Description: Three of Alphonse Pénaud's flying models. Top to bottom: the Hèlicoptère, the Planophore and the flapping wing Mechanical Bird. Early 1870s.
Title: Pénaud's flying models
Credit: Encyclopaedia Britannica (?)
Author: Unknown authorUnknown author
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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