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| Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome black and white SI Neg. CCC-3020. Date: 6/25/1931....Trolley Pole Machine at Machine Shop.Trolley Pole at Machine Shop.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-3020. Date: 6/25/1931....Trolley Pole Machine at Machine Shop.Trolley Pole at Machine Shop.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) | ||||
