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.)
Filing date
Publication date
Application filed by Sobottka Gustav BraunkohlefiledCriticalSobottka Gustav Braunkohle
Priority to DD29014986ApriorityCriticalpatent/DD249094B3/de
Publication of DD249094A1publicationCriticalpatent/DD249094A1/de
Publication of DD249094B3publicationCriticalpatent/DD249094B3/de