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Priority to DE19712122550priorityCriticalpatent/DE2122550C/de
Priority claimed from DE19712122550external-prioritypatent/DE2122550C/de
Priority to AT139372Aprioritypatent/AT315733B/de
Publication of DE2122550A1publicationCriticalpatent/DE2122550A1/de
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Publication of DE2122550CpublicationCriticalpatent/DE2122550C/de