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Publication of FR1178546ApublicationCriticalpatent/FR1178546A/fr
B64C39/06—Aircraft not otherwise provided for having disc- or ring-shaped wings
B64C39/062—Aircraft not otherwise provided for having disc- or ring-shaped wings having annular wings
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FR1178546D1957-06-181957-06-18Perfectionnements apportés aux aérodynes à voilure en forme de tunnel, notamment à ceux à décollage vertical
ExpiredFR1178546A
(fr)