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Scientific American 1920-08-21

ScientificAmerican1920-08-21.jpg Scientific American 1918-06-01ThumbnailsTechnical World 1913-07Scientific American 1918-06-01ThumbnailsTechnical World 1913-07Scientific American 1918-06-01ThumbnailsTechnical World 1913-07Scientific American 1918-06-01ThumbnailsTechnical World 1913-07

The largest of its kind, 350-ton crane at Philadelphia Navy Yard.