B28B 21/18
Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using expansible or retractable mould or core elements
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Edits on 16 Mar, 2022
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Edits on 9 Mar, 2022
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B28B 21/18
Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using expansible or retractable mould or core elements
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