Keywords: history of technology historyoftechnology mining smithsonian probably public domain probablypublicdomain blackandwhite monochrome outdoor black and white SI Neg. CCC-3140. Date: 5/25/1936....29-B Drop-Head Cutting Machine (Raised) (Mine 204-7).29-B Drop head machine (raised), 204-7.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) SI Neg. CCC-3140. Date: 5/25/1936....29-B Drop-Head Cutting Machine (Raised) (Mine 204-7).29-B Drop head machine (raised), 204-7.From the Consolidation Coal Company collection, National Museum of American History...Credit: unknown (Smithsonian Institution) |