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Procédé pour le traitement métallurgique de grains oolithiques extraits des minettes, ainsi que d'autres minerais pulvérulents ou minerais impalpables à forte teneur en fer
Procédé pour le traitement métallurgique de grains colithiques extraits des minettes, ainsi que d'autres minerais pulvérulents, ou minerais impalpables à forte teneur en fer