History is not only a kind of remembrance for future generations, but more importantly, it is inspired by understanding: only continuous innovation can have real vitality. History has proved that, as far as wire and cable equipment manufacturers know, the development of wire and cable products is closely related to social progress, and a major technological breakthrough will promote a sudden change in a certain field of society. 1. Discovery that "electricity" can be transmitted along metal wires (before 1800) In 500 BC, Thales of Greece discovered that friction generates electricity. In 1729, the British Gray discovered that "electricity" could be transmitted along metal wires, and humans had the concept of "conductor". In 1740, De Zagurlier of France stipulated the definition of conductor and insulation. In 1744, the German Winkler used wires to transmit discharge sparks to long distances, announcing the birth of wires. In 1752, American Franklin invented the lightning rod and grounded it with wires. This was the first practical use of wires. In 1799, the Italian Volt invented the battery and obtained continuous current. 2. The invention of the "telegraph" promoted the development and application of telegraph cables (before 1875) At the beginning of the nineteenth century, a large number of European and American physicists, such as Oersted in Denmark, Faraday in Britain, Ohm in Germany, and Henry in the United States, continuousl