using expansible or retractable mould or core elements

Full Title

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

Child Classifications

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• B28B 21/20 using inflatable cores, e.g. having a frame inside the inflatable part of the core (connection of valves to inflatable elastic bodies B60C29/00)