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Armstrong’s hydraulic crane

Armstrong’s hydraulic crane.jpg Backmann’s proposed helicoidal elevatorThumbnailsWorthington tandem compound steam pumpsBackmann’s proposed helicoidal elevatorThumbnailsWorthington tandem compound steam pumpsBackmann’s proposed helicoidal elevatorThumbnailsWorthington tandem compound steam pumpsBackmann’s proposed helicoidal elevatorThumbnailsWorthington tandem compound steam pumps