Numerous firms , including ABB , Siemens , E+H, and Emerson , lead the factory automation sector . ASEA Brown Boveri specializes in automated systems and drives , while Siemens features a comprehensive https://tealbookmarks.com/story21921483/abb-versus-siemens-versus-endress-hauser-versus-emerson-electric-a-look-at-leading-automation-firms