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 Pierre DemartfiledCriticalPierre Demart
Priority to BE581935ApriorityCriticalpatent/BE581935A/fr
Publication of BE581935ApublicationCriticalpatent/BE581935A/fr