In the midsummer of 1988, Lu Feng, an assembly worker at a radio factory, constantly locked horns with rigorous quality inspector Gao Qiang for privately modifying tools. The failure of a homemade musical doorbell turned the two from mutual stubbornness to joint problem-solving. They sold their bicycles, experimented repeatedly, and continuously improved their designs in moisture resistance, anti-interference, and industrial mass production. Later, when the imported production line broke down due to power grid fluctuations, the two relied on practical experience to complete the transformation, allowing the domestically made doorbell to roll off the production line smoothly. Through technological innovation, they won factory recognition and eligibility for the adult college entrance examination, growing into technical backbones fighting side by side two years later.