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Application filed by Pavel Letko, Vladimir Ing Huml, Exnerova Karla, Bohumir Ing KozminfiledCriticalPavel Letko
Priority to CS865433ApriorityCriticalpatent/CS257246B1/en
Publication of CS543386A1publicationCriticalpatent/CS543386A1/en
Publication of CS257246B1publicationCriticalpatent/CS257246B1/en