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 Jean PurnellefiledCriticalJean Purnelle
Priority to BE582799ApriorityCriticalpatent/BE582799A/fr
Publication of BE582799ApublicationCriticalpatent/BE582799A/fr