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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 FR791928Aexternal-prioritypatent/FR1317203A/fr
Application filedfiledCritical
Priority to FR837360ApriorityCriticalpatent/FR573M/fr
Priority to FR856886Aprioritypatent/FR11F/fr
Application grantedgrantedCritical
Publication of FR573MpublicationCriticalpatent/FR573M/fr