Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome black and white SI Neg. CCC-3071. Date: 9/8/1932....SAFETY Car Min No. 206.Mine Car - with Safety Warning.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-3071. Date: 9/8/1932....SAFETY Car Min No. 206.Mine Car - with Safety Warning.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) |