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Publication date
Priority claimed from CS857273Aexternal-prioritypatent/CS251846B1/en
Application filed by Ludek Ing Holub, Helena Ing Hofmanova, Jindrich Dipl Tech MatejkafiledCriticalLudek Ing Holub
Priority to CS732885ApriorityCriticalpatent/CS254454B3/en
Publication of CS732885A1publicationCriticalpatent/CS732885A1/en
Publication of CS254454B3publicationCriticalpatent/CS254454B3/en