THC 2003.902.235 Tapping Slag from Experimental Blast Furnace photo about 2 years 0 THC 2003.902.119 T. Hignett Control Instruments of the Blast Furnace photo about 2 years 0 THC 2003.902.232 Tapping Slag from Experimental Blast Furnace photo about 2 years 0 THC 2003.902.127 T. Hignett Optical Pyrometer photo about 2 years 0 THC 2003.902.122 Ore Crushing Machinery photo about 2 years 1 THC 2003.902.107 Tapping Slag from Experimental Blast Furnace photo about 2 years 0