Relays have played a crucial role in communication systems for decades. These electromagnetic devices, which act as intermediaries between circuits, enable signals to be transmitted over long distances, ensuring that communication networks function smoothly and efficiently. From telegraph systems to modern-day telecommunication networks, relays have been indispensable in connecting people and enabling the exchange of information. In this article, we will explore the importance of relays, particularly highlighting the innovative contributions made by companies like Meishuo.