Firestone Industrial Products joined Bridgestone in the 1980s. Patented ultrasonic internal height sensor enhances the safety of air springs. Develop an air spring for the front end air suspension system. Opening manufacturing facilities in Williamsburg, Kentucky, and Dyersburg, Tennessee. In the 1990s, the company was certified by ISO 9000 and QS 9000. Published DIVINE's technical report (Experimental Dynamic Interaction between vehicle and Infrastructure) demonstrating the numerous benefits of air suspension systems. Firestone expanded the automotive air assist product line by installing Coil-Rite springs into the inner diameter of Coil springs.