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B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
B28B21/00—Methods or machines specially adapted for the production of tubular articles
B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
B28B21/68—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts and applying centrifugal forces
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FR625898D1926-03-191926-03-19Procédé de fabrication de tuyaux en ciment armé avec âme tubulaire en tôle d'acier
ExpiredFR625898A
(fr)
Procédé de fabrication d'éléments tubulaires creux, en ciment armé, pouvant s'assembler, par emboîtement, pour la constitution de potaux, par exemple