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Application filed by Robert DeloorfiledCriticalRobert Deloor
Priority to BE395880ApriorityCriticalpatent/BE395880A/fr
Publication of BE395880ApublicationCriticalpatent/BE395880A/fr
Priority to FR770092Dprioritypatent/FR770092A/fr
Priority to DE1934D0067695prioritypatent/DE623706C/de