Numerous firms , including ABB , Electrical Siemens, E+H, and Emerson Electric, lead the process automation landscape . ABB specializes in power & automation and drives , while Electrical Siemens https://bookmarkleader.com/story21997815/asea-brown-boveri-versus-electrical-siemens-versus-endress-hauser-versus-emerson-a-look-at-industrial-automation-giants