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Men swing a heavy rod into an open furnace during the "tapping out" operation in the process of making steel.
19.1 x 15.5 cm
- still image
- These materials are either in the public domain, according to U.S. copyright law, or permission has been obtained from rights owners. The digital version and supplementary materials are available for all educational uses worldwide.
- The Janet A. Ginsburg Chicago Tribune Image Collection
- Chicago Sunday Tribune (April 19, 1931), p. 3
- Colorado Fuel and Iron Company