Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filedfiledCritical
Priority to DD18313274ApriorityCriticalpatent/DD120941A1/xx
Priority to DE19752541789prioritypatent/DE2541789C2/de
Priority to CH1261075Aprioritypatent/CH590486A5/xx
Priority to SU752180260Aprioritypatent/SU836615A1/ru
Priority to CS781775Aprioritypatent/CS175293B1/cs
Publication of DD120941A1publicationCriticalpatent/DD120941A1/xx