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Priority to CS304774ApriorityCriticalpatent/CS171493B1/cs
Priority to HU75TE810Aprioritypatent/HU174648B/hu
Priority to DE19752508791prioritypatent/DE2508791A1/de
Priority to DE19757506322prioritypatent/DE7506322U/de
Publication of CS171493B1publicationCriticalpatent/CS171493B1/cs