Valcovny Trub Chomutov a.s.
- Mill manufacturing seamless steel tubes. Includes information on the technology, history, and products available, with an image gallery, news, and contact details.
- http://www.vtchomutov.cz/

SEA Chomutov s. r. o.
- Engineering firm. Contains example products designed and developed, methods used, and other services offered, plus contact details, references, and a map.
- http://www.sea-cv.cz/en/