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Armstrong’s hydraulic crane

Armstrong’s hydraulic crane.jpg Worthington tandem compound steam pumpsMiniaturesBackmann’s proposed helicoidal elevatorWorthington tandem compound steam pumpsMiniaturesBackmann’s proposed helicoidal elevatorWorthington tandem compound steam pumpsMiniaturesBackmann’s proposed helicoidal elevatorWorthington tandem compound steam pumpsMiniaturesBackmann’s proposed helicoidal elevator