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Priority claimed from CH382179Aexternal-prioritypatent/CH635546A5/fr
Application filed by Speno InternationalfiledCriticalSpeno International
Priority to IN166/DEL/83ApriorityCriticalpatent/IN158932B/en
Publication of IN158932BpublicationCriticalpatent/IN158932B/en
Procede pour materialiser optiquement au moins une categorie de defauts geometriques d'une voie ferree et dispositif pour la mise en oeuvre de ce procede.