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Priority claimed from DE2403211Aexternal-prioritypatent/DE2403211C3/en
Priority claimed from DE2405578Aexternal-prioritypatent/DE2405578B2/en
Priority claimed from AT39176Aexternal-prioritypatent/AT359339B/en
Application filed by Perdent GmbhfiledCriticalPerdent Gmbh
Publication of ATA654876ApublicationCriticalpatent/ATA654876A/en
Application grantedgrantedCritical
Publication of AT350176BpublicationCriticalpatent/AT350176B/en