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Armstrong’s hydraulic crane

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Armstrong’s hydraulic crane.jpg Abraham blessed by MelchizedekThumbnailsBackmann’s proposed helicoidal elevatorAbraham blessed by MelchizedekThumbnailsBackmann’s proposed helicoidal elevatorAbraham blessed by MelchizedekThumbnailsBackmann’s proposed helicoidal elevatorAbraham blessed by MelchizedekThumbnailsBackmann’s proposed helicoidal elevator