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| Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome black and white SI Neg. CCC-3163D. Date: 1/1937....4 Negatives of cutter bar support 29B Jeffrey.Cutter bar support 29-B - top, bottom, right & left views.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-3163D. Date: 1/1937....4 Negatives of cutter bar support 29B Jeffrey.Cutter bar support 29-B - top, bottom, right & left views.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) | ||||
