Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome black and white SI Neg. CCC-1831. Date: 1920....Spirle Shute 205 Mine.Spiral Chute, #205 Mine 20 reg..From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-1831. Date: 1920....Spirle Shute 205 Mine.Spiral Chute, #205 Mine 20 reg..From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) |