In 1876, Alexander Graham Bell took out a patent for telephone apparatus which was expected to open up the long-distance communication sphere for wide public One year later, the first European telephone line was already operating in Berlin. The first Prague telephone exchange started its operation in 1882. It was located at Malé náměstí and its eleven subscribers responded by exclaiming “ha-hey!” In June 1891, they built a view tower on Petřín hill in Prague. It became a cradle of Czechoslovak telegraphy, radio and television. The beginnings of Czechoslovak electronic industry go back as far the year 1894, when Frantisek Krizik founded his factory in Prague-Karlín.