Numerous companies , including ABB , Siemens , Endress+Hauser , and Emerson Electric, dominate the process automation sector . ASEA Brown Boveri specializes in automated systems and drives , while Siemens https://yxzbookmarks.com/story21969474/asea-brown-boveri-versus-electrical-siemens-versus-endress-hauser-versus-emerson-electric-a-look-at-leading-automation-firms