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... ?? U, &BSOLUTE PREVENTION OF SMOKE. A NATIONAL PROBLEM SOLVED. IMMENSE ECONOMY IN COST OF COAL. Slack and Waste Rendered as efficient as Large Coal. A MARVELLOUS INVENTION, THE HOPCRAFT FURNACE. A Proved Commercial Success. It is well known to Manufacturers, Steamship Owners, and all users of steam power that the small or dust of most descriptions of coal contain praoti- eally the tame heat ...