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Correcting erection discrepancies

Correcting erection discrepancies.jpg Backmann’s proposed helicoidal elevatorThumbnailsEiffel Tower 1889Backmann’s proposed helicoidal elevatorThumbnailsEiffel Tower 1889Backmann’s proposed helicoidal elevatorThumbnailsEiffel Tower 1889Backmann’s proposed helicoidal elevatorThumbnailsEiffel Tower 1889