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Backmann’s proposed helicoidal elevator

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Backmann’s proposed helicoidal elevator.jpg Bain-froid ChevrierThumbnailsAt the Races on the Champ de MarsBain-froid ChevrierThumbnailsAt the Races on the Champ de MarsBain-froid ChevrierThumbnailsAt the Races on the Champ de MarsBain-froid ChevrierThumbnailsAt the Races on the Champ de Mars