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Application filed by Vladimir Ing Valasek, Jan Ing PodhradskyfiledCriticalVladimir Ing Valasek
Priority to CS842092ApriorityCriticalpatent/CS240548B1/en
Publication of CS209284A1publicationCriticalpatent/CS209284A1/en
Publication of CS240548B1publicationCriticalpatent/CS240548B1/en