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 BE650691ApriorityCriticalpatent/BE650691A/xx
Publication of BE650691ApublicationCriticalpatent/BE650691A/xx
Priority to DE1965E0029719prioritypatent/DE1457987C3/de