71548532
Jan 31, 1948
Dec 23, 1952
SUCTION VENTILATION HOODS AND WALLS USED ADJACENT FOUNDRY EQUIPMENT AND OTHER INDUSTRIAL MACHINES WHICH GIVE RISE TO DUST AND FUMES, THE HOODS AND VENTILATION WALLS MAVING OPENINGS FOR THE RECEPTION OF SUCH DUST AND FUMES, AND SUCH HOODS AND WALLS BEING CONNECTED TO SUCTION DEVICES FOR THE DRAWING OF SUCH DUST AND FUMES THEREINTO
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