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Application filed by Georgi K Ing Petkov, Stamen N Ing Stojev, Nikolaj I Ing Radev, Boto P Ing Botev, Ivan Ch Ing Najdenov, Jakim N Ing Petrov, Stefan P Ing MincevfiledCriticalGeorgi K Ing Petkov
Priority to CS855719ApriorityCriticalpatent/CS571985A1/en
Publication of CS571985A1publicationCriticalpatent/CS571985A1/en