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 Henri Speters, Henri Charles Georges WalmachfiledCriticalHenri Speters
Priority to BE594879ApriorityCriticalpatent/BE594879A/fr
Publication of BE594879ApublicationCriticalpatent/BE594879A/fr