MAKE A MEME View Large Image ...From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-2139. Date: 10/3/1921....Safety Switch.From the Consolidation Coal Company collection, National ...
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Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome black and white SI Neg. CCC-2139. Date: 10/3/1921....Safety Switch.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-2139. Date: 10/3/1921....Safety Switch.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution)
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