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 Veuve Auguste-Etienne DefrancefiledCriticalVeuve Auguste-Etienne Defrance
Priority to BE603501ApriorityCriticalpatent/BE603501A/fr
Publication of BE603501ApublicationCriticalpatent/BE603501A/fr