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| Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome black and white SI Neg. CCC-3247. Date: 2/6/1940....Signs 0 Co. rules posted at 207 M. O. .Rules for all types workers.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-3247. Date: 2/6/1940....Signs 0 Co. rules posted at 207 M. O. .Rules for all types workers.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) | ||||
