Read the text and decide if the statement is true, false or not stated. The first electronic device is a relay, a remote switch controlled by electricity, which was invented in 1835 by Joseph Henry. Thanks to such an invention, it became possible to make modern telegraphy. The first relay was used as part of his telegraph system in 1844. It was used in telegraph lines, repeating a signal coming from one line and transmitting it to another. Since then, relays have been used in telephone exchanges and first computers to make logical operations. The first electronic device was invented in the second half of the 19th century.