Golden Plated Elevator Cut-off

Golden plated Elevator Cut-off

In 1885, British C. Bradley invented a molded carbon core resistor. In 1897, British T. Gabriel and A. Harris made carbon film resistors with carbon ink. From 1913 to 1919, W. Swann of the United Kingdom and F. Kruger of Germany invented metal film resistors. In 1925, the German company Siemens-Halsk invented the thermal decomposition carbon film resistor, breaking the monopoly market of carbon solid core resistors. After the advent of the transistor, the requirements for miniaturization and resistance stability of the resistor are stricter, which promotes the development of various new types of resistors. Bell Labs of the United States developed a TaN resistor in 1959. Since the 1960s, new technologies such as roller magnetron sputtering and laser resistance trimming have been adopted, and some products have been developed in terms of planarization, integration, miniaturization and flaking.