Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome outdoor black and white SI Neg. CCC-3148. Date: 5/25/1936....29 LR Cutting Machine Lowered Mine 214-14A.29 LR Cutting Machine, 214-14A.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-3148. Date: 5/25/1936....29 LR Cutting Machine Lowered Mine 214-14A.29 LR Cutting Machine, 214-14A.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) |