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This Act not to extend to owners of furnaces of steam engines erected solely for working mines, &c.
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3. Provided always, that the provisions of this Act, as far as they relate to the payment of costs and the alteration of furnaces, shall not extend or be construed to extend to the owner or proprietors or occupiers of any furnaces of steam engines erected solely for the purpose of working mines of different descriptions, or employed solely in the smelting of ores and minerals, or in the manufacturing of the produce of such ores or minerals on or immediately adjoining the premises where they are raised.
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