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In page Austria-Hungary:

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The first telegraph connection (Vienna—Brno—Prague) had started operation in 1847.[1] In Hungarian territory the first telegraph stations were opened in Pressburg (Pozsony, today's Bratislava) in December 1847 and in Buda in 1848. The first telegraph connection between Vienna and Pest–Buda (later Budapest) was constructed in 1850,[citation needed] and Vienna–Zagreb in 1850.[2]