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Application filed by Karel Hartman, Jan Dvorak, Vaclav Plodik, Jaroslav CermakfiledCriticalKarel Hartman
Priority to CS852631ApriorityCriticalpatent/CS253386B1/en
Publication of CS263185A1publicationCriticalpatent/CS263185A1/en
Publication of CS253386B1publicationCriticalpatent/CS253386B1/en