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 Fernand LaffutfiledCriticalFernand Laffut
Priority to BE590295ApriorityCriticalpatent/BE590295A/en
Publication of BE590295ApublicationCriticalpatent/BE590295A/en