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AU3873597A
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Method and apparatus for measuring the volume of a medium in a tank
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EP0225875A1
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Method and apparatus for recovering silver from liquids
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EP0057034A2
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A device for the filtration of fluids
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Apparatus for recovery of re-usable substances from a fixing bath in processes for development and fixing of photographic films and X-ray films
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Procedure and device for electrolytic recovery of soul and other recyclable substances from a film fixing pool
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Ore concentrator
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