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GB101549A
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Improvements in Rabbles for Mechanical Roasting Furnaces.
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US1220513A
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Rabble for mechanical roasting-furnaces.
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GB191408766A
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A New or Improved Process of and Apparatus for Treating Ores or other Materials in Roasting and Drying Furnaces.
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GB191215778A
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Improvements in and relating to Mechanical Furnaces for Roasting or Roasting and Drying Ores and the like Materials.
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CA133805A
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Zinc extraction
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GB190928611A
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Improvements in or relating to the Extraction of Metals from their Ores.
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GB190918817A
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Improvements in or relating to the Treatment of Complex Zinc Ores.
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CA110324A
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Rotary furnace
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US888502A
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Rotary furnace applicable for use in roasting ores or the like.
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GB190723901A
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Improvements in the Separation of Zinc from its Ores or Compounds.
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GB190627639A
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An Improved Rotary Furnace applicable for use in Roasting Ores and the like.
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CA90450A
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Rotary furnace
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