In 1832, the Russian diplomat Schilling made a telegraph that used the deflection of the galvanometer pointer to receive information. In June 1837, the British young man Cook obtained the first telegraph invention patent. In 1835 After three years of study by the American painter Morse, the first telegraph machine came out. Morse successfully used the "on", "off" and "long break" of electric current to replace human words for transmission. This is The famous Morse code. Walkie-talkie technology first emerged in the turbulent twenties, in the laboratory of Westinghouse. An eccentric inventor named John Kermode "whimsically" wanted to automatically sort postal documents. At that time, every idea about the application of electronic technology was very novel. His idea was to mark envelopes with walkie-talkies, where the message in the walkie-talkies would be the recipient's address, much like today's postal codes. For this reason, Kermode invented the earliest walkie-talkie logo. The design was very simple, that is, one "bar" represented the number "1", two "bars" represented the number "2", and so on. He then invented a walkie-talkie reading device consisting of basic components: a method (capable of emitting light and receiving reflected light) to measure the reflected signal strips and voids, the edge positioning coil; and a method of using the measurement results, the translator coder. One day in April 1973, a man stood on the street in New York, took out a wireless phone about two bricks in size, and made a call, which attracted passers-by to stop and look at him. This man is Martin Cooper, the inventor of the mobile phone. At that time, Cooper was an engineering technician at the famous American Motorola Company.