Numerous firms , including ASEA Brown Boveri, Siemens , Endress+Hauser , and Emerson , represent the industrial automation sector . ABB offers power & automation and drives , while Electrical Siemens https://bookmarkbooth.com/story21975147/asea-brown-boveri-versus-siemens-versus-e-h-versus-emerson-a-comparison-at-leading-automation-firms