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Individual
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Individual
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Priority to ES9254ApriorityCriticalpatent/ES9254A3/en
Publication of ES9254A3publicationCriticalpatent/ES9254A3/en
A system of cast steel or mild iron discs or plates, with evenly projected holes, provided with a flange or rebate in their lower part, to which some molds or small copper, bronze or brass discs that are projected are attached.