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Siemens’ electric rack-climbing elevator of 1880

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Siemens’ electric rack-climbing elevator of 1880.jpg Backmann’s proposed helicoidal elevatorThumbnailsL’Arche du Pont Notre-DameBackmann’s proposed helicoidal elevatorThumbnailsL’Arche du Pont Notre-DameBackmann’s proposed helicoidal elevatorThumbnailsL’Arche du Pont Notre-DameBackmann’s proposed helicoidal elevatorThumbnailsL’Arche du Pont Notre-DameBackmann’s proposed helicoidal elevatorThumbnailsL’Arche du Pont Notre-Dame