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Backmann’s proposed helicoidal elevator

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Backmann’s proposed helicoidal elevator.jpg Armstrong’s hydraulic craneThumbnailsCorrecting erection discrepanciesArmstrong’s hydraulic craneThumbnailsCorrecting erection discrepanciesArmstrong’s hydraulic craneThumbnailsCorrecting erection discrepanciesArmstrong’s hydraulic craneThumbnailsCorrecting erection discrepancies