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| Keywords: outdoor truss architecture building building structure Lot-9427-5: Navy Builds Submarine Chasers Bottoms Up. Upside down construction of 173-foot submarine chasers for the U.S. Navy has so speeded production that is now possible to turn out one every week, President Franklin D. Roosevelt revealed. Sections of the ships are welded together bottoms up, the hull sections braced and the craft then turned right side up by the specially rigged gantry cranes. Photograph released March 1942 by Office of War Information. (2015/11/20). Lot-9427-5: Navy Builds Submarine Chasers Bottoms Up. Upside down construction of 173-foot submarine chasers for the U.S. Navy has so speeded production that is now possible to turn out one every week, President Franklin D. Roosevelt revealed. Sections of the ships are welded together bottoms up, the hull sections braced and the craft then turned right side up by the specially rigged gantry cranes. Photograph released March 1942 by Office of War Information. (2015/11/20). | ||||
