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
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Priority claimed from FR5254Aexternal-prioritypatent/FR1453821A/fr
Priority claimed from FR40091Aexternal-prioritypatent/FR89408E/fr
Application filedfiledCritical
Publication of BE676057ApublicationCriticalpatent/BE676057A/xx
