71283444
May 3, 1929
Jan 7, 1930
MACHINES FOR TREATING ORE AND FUMING OFF VOLATILE METALS, MACHINES FOR SINTERING OR AGGLOMERATING ORE, MACHINES FOR RECOVERING VOLATILE GASES, MACHINES FOR HEATING TO DISPEL GASES THEREFROM, MACHINES FOR RECOVERING METALS IN THE FORM OF FUME, MACHINES FOR ROASTING ORES AND BURNING SULPHUR, AND PARTS THEREOF
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