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Priority to FR46020ApriorityCriticalpatent/FR1444289A/fr
Priority to BE680168Dprioritypatent/BE680168A/xx
Priority to CH661766Aprioritypatent/CH439219A/fr
Priority to NL6606882Aprioritypatent/NL6606882A/xx
Application grantedgrantedCritical
Publication of FR1444289ApublicationCriticalpatent/FR1444289A/fr