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Priority to DE19712137403priorityCriticalpatent/DE2137403C/de
Priority claimed from DE19712137403external-prioritypatent/DE2137403C/de
Publication of DE2137403B2publicationCriticalpatent/DE2137403B2/de
Publication of DE2137403A1publicationCriticalpatent/DE2137403A1/de
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Publication of DE2137403CpublicationCriticalpatent/DE2137403C/de