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Priority claimed from FI760442Aexternal-prioritypatent/FI64534C/en
Application filed by Gen ElectricfiledCriticalGen Electric
Publication of FI791510ApublicationCriticalpatent/FI791510A/en
Application grantedgrantedCritical
Publication of FI74837BpublicationCriticalpatent/FI74837B/en
Publication of FI74837CpublicationCriticalpatent/FI74837C/en