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
Priority claimed from FR793299Aexternal-prioritypatent/FR1233037A/fr
Priority claimed from FR803816Aexternal-prioritypatent/FR1243030A/fr
Application filed by Robert DuponchellefiledCriticalRobert Duponchelle
Publication of BE589869ApublicationCriticalpatent/BE589869A/fr