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Priority claimed from DE2539900Aexternal-prioritypatent/DE2539900B2/en
Application filed by Siemens AgfiledCriticalSiemens Ag
Priority claimed from AT734477Aexternal-prioritypatent/AT357983B/en
Publication of ATA224777ApublicationCriticalpatent/ATA224777A/en
Application grantedgrantedCritical
Publication of AT353894BpublicationCriticalpatent/AT353894B/en