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Bain-froid Chevrier

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Bain-froid Chevrier.jpg Backmann’s proposed helicoidal elevatorThumbnailsBesnier's flying apparatusBackmann’s proposed helicoidal elevatorThumbnailsBesnier's flying apparatusBackmann’s proposed helicoidal elevatorThumbnailsBesnier's flying apparatusBackmann’s proposed helicoidal elevatorThumbnailsBesnier's flying apparatusBackmann’s proposed helicoidal elevatorThumbnailsBesnier's flying apparatus