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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Publication date
Priority claimed from DEG37360Uexternal-prioritypatent/DE1967034U/de
Priority claimed from DEG39387Uexternal-prioritypatent/DE1989275U/de
Application filedfiledCritical
Publication of BE716639ApublicationCriticalpatent/BE716639A/xx
