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.)
Publication of NL126640CpublicationCriticalpatent/NL126640C/xx
Priority claimed from DEO8282Uexternal-prioritypatent/DE1922542U/de
Priority claimed from FR68711Aexternal-prioritypatent/FR1486193A/fr