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Scientific American 1920-08-21

ScientificAmerican1920-08-21.jpg Scientific American 1918-06-01ThumbnailsScientific American 1921-06-11Scientific American 1918-06-01ThumbnailsScientific American 1921-06-11Scientific American 1918-06-01ThumbnailsScientific American 1921-06-11Scientific American 1918-06-01ThumbnailsScientific American 1921-06-11

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