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Priority claimed from US740598Aexternal-prioritypatent/US2865808A/en
Priority claimed from US781834Aexternal-prioritypatent/US2902483A/en
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Priority to FR837403ApriorityCriticalpatent/FR606M/fr
Application grantedgrantedCritical
Publication of FR606MpublicationCriticalpatent/FR606M/fr