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 Leon Ernaelsteen, Yves CoulougnonfiledCriticalLeon Ernaelsteen
Priority to BE611762ApriorityCriticalpatent/BE611762A/fr
Publication of BE611762ApublicationCriticalpatent/BE611762A/fr