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Application filed by Friedrich Kloeppel, Vladimir Vesely, Jan VykypelfiledCriticalFriedrich Kloeppel
Priority to DD22718781ApriorityCriticalpatent/DD156307A1/de
Priority to CS578081Aprioritypatent/CS221583B1/cs
Publication of DD156307A1publicationCriticalpatent/DD156307A1/de