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Application filed by Josef Ing Ondra, Zdenek Ing Sury, Jan HrabalekfiledCriticalJosef Ing Ondra
Priority to CS879767ApriorityCriticalpatent/CS267267B1/cs
Publication of CS976787A1publicationCriticalpatent/CS976787A1/cs
Publication of CS267267B1publicationCriticalpatent/CS267267B1/cs