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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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Publication date
Priority claimed from CH6255058Aexternal-prioritypatent/CH371793A/it
Priority claimed from FR796372Aexternal-prioritypatent/FR1295338A/fr
Application filedfiledCritical
Priority to FR837277ApriorityCriticalpatent/FR510M/fr
Application grantedgrantedCritical
Publication of FR510MpublicationCriticalpatent/FR510M/fr
