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Application filed by Karel Ing Sperling, Vladivoj Ing Ocenasek, Karel Ing Csc Placek, Jaroslav Ing OpatfiledCriticalKarel Ing Sperling
Priority to CS817458ApriorityCriticalpatent/CS238563B1/en
Publication of CS745881A1publicationCriticalpatent/CS745881A1/en
Publication of CS238563B1publicationCriticalpatent/CS238563B1/en