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Priority claimed from CH255461Aexternal-prioritypatent/CH383320A/de
Priority claimed from DEJ20763Aexternal-prioritypatent/DE1151779B/de
Application filedfiledCritical
Priority to FR887458ApriorityCriticalpatent/FR81125E/fr
Application grantedgrantedCritical
Publication of FR81125EpublicationCriticalpatent/FR81125E/fr