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One of two 10 ton Unloading and Reclaiming Ore Detroit, Michigan. Designed primarily for the un- the bucket about a vertical axis which facilitates Bridges designed and built by Dravo Corporation loading of lake steamers, these bridges have the clean up of ship holds. A modern worm drive pro- for the Great Lakes Steel Corporation at Ecorse, feature of a lift apron and also a device for rotating | vides smooth travel and increases the safety factor. 14