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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.)
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Priority claimed from FR10277Aexternal-prioritypatent/FR1437546A/fr
Priority claimed from FR44114Aexternal-prioritypatent/FR1469160A/fr
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Publication of BE689180ApublicationCriticalpatent/BE689180A/fr