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Application filed by Rudolf Petzoldt, Heinz SchmidtfiledCriticalRudolf Petzoldt
Priority to DD20317678ApriorityCriticalpatent/DD135573B1/de
Publication of DD135573A1publicationCriticalpatent/DD135573A1/de
Publication of DD135573B1publicationCriticalpatent/DD135573B1/de