news High-speed rail bogie shock absorber block tri(dimethylaminopropyl)amine CAS 33329-35-0 high-frequency vibration attenuation system High-speed iron bogie shock absorber block tri(dimethylaminopropyl)amine CAS 33329-35-0 High-frequen... 03/2022High-speed rail bogie shock absorber block tri(dimethylaminopropyl)amine CAS 33329-35-0 high-frequency vibration attenuation system