BUTLER

METAL BINS, TANKS AND BUILDINGS FOR THE STORAGE OF BULK MATERIALS OTHER THAN STONE AND SAND; STATIONARY AND PORTABLE METAL TANKS FOR LIQUIDS; [ STOCK WATERING TROUGHS; ] FEED BINS, HOPPERS AND BUNKERS; SILOS; CORN CRIBS; AND GRAIN BINS AND TANKS HAVING FORCED AIR CIRCULATION WITH OR WITHOUT SUPPLEMENTAL HEATING