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Priority claimed from AT417866Aexternal-prioritypatent/AT270470B/de
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Priority to FR104573ApriorityCriticalpatent/FR1521158A/fr
Priority claimed from AT990567Aexternal-prioritypatent/AT275377B/de
Application grantedgrantedCritical
Publication of FR1521158ApublicationCriticalpatent/FR1521158A/fr