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B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
B28B7/00—Moulds; Cores; Mandrels
B28B7/28—Cores; Mandrels
B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
B28B7/303—Cores; Mandrels adjustable, collapsible, or expanding specially for making undercut recesses or continuous cavities the inner section of which is superior to the section of either of the mouths
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FR667938D1929-01-231929-01-23Procédé de moulage et dispositif de noyau s'y rapportant
ExpiredFR667938A
(fr)